Settings

Make Firefox your default browser on Windows

Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.

Add-on Badges

You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.

Firefox Page Info window

The Firefox “Page Info” window gives you details about the page you're on. You can also use it to change permissions for the website.

Firefox options, preferences and settings

Settings panels give you access to Firefox settings. This article describes what types of settings are available in each panel.

Thunderbird and Junk / Spam Messages

This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").

Manage local site storage settings

Learn about local storage, how to access storage settings, remove site data or set exceptions for websites to store data in Firefox.

Customize Firefox controls, buttons and toolbars

You can customize Firefox in many ways. This article explains how to customize Firefox controls, buttons and toolbars.

Connection settings in Firefox

Your organization or Internet Service Provider may offer or require you to use a proxy to connect to the Internet. Learn more.

Automatically fill in credit card and payment method data on Web forms

Manage credit card autofill settings in Firefox version 81 and above.

Firefox Translation

The built-in Firefox full page translation feature allows you to seamlessly browse the web in your preferred language. Learn more.

Web Push notifications in Firefox

Web Push allows websites to notify users of new messages or updated content while Firefox is open.

Sponsored shortcuts on the New Tab page

Working with its advertising partners, Mozilla may place sponsored shortcuts on the default Firefox home page and New Tab page. Learn more.

Firefox's performance settings

Firefox automatically uses settings that work best with your computer. You can always change these settings.

Import bookmarks and other data from Google Chrome

Firefox lets you easily import bookmarks and other data from Google Chrome. This article gives you step-by-step instructions for getting it done.

Refresh Firefox - reset add-ons and settings

A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.

Watch DRM content on Firefox

Learn about Digital Rights Management (DRM) content in Firefox and how to disable and re-enable DRM playback or troubleshoot problems.

Personalized extension recommendations

Learn more about how Firefox occasionally recommends extensions you may find interesting and how to opt-out.

Firefox Password Manager - Alerts for breached websites

Firefox's password management will show you alerts about logins potentially exposed in data breaches and passwords that may be vulnerable.

Make Firefox your default browser

How to make Web links open in Firefox automatically by setting it as the default browser on your computer.

Back up and restore information in Firefox profiles

Firefox stores your personal data and settings in a profile folder. Learn how to back up and restore this important information.

Pop-up blocker settings, exceptions and troubleshooting

Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.

Global Privacy Control

How to make Firefox advise websites that you visit not to sell or share your browsing information.

Import data from another browser

We'll show you how to import bookmarks, preferences, browsing history, passwords and other information from another browser.

Restore the Menu bar in Firefox

The Firefox Menu bar (File, Edit, View, History, Bookmarks, etc.) may be hidden or missing. Learn how to restore the Menu bar.

Filelink for Large Attachments

Messages with large attachments are often rejected by mail servers. Thunderbird can use web-based storage services to send large file attachments.

Firefox translation for Android

The built-in translation feature allows you to seamlessly browse the web in your preferred language. Learn more.

How to manage your camera and microphone permissions with Firefox

How to enable or block sites from accessing your camera and microphone on your desktop or mobile device.

Switch from Chrome to Firefox

Firefox can automatically move bookmarks, passwords, history and other preferences from Chrome without deleting it or interfering with any of its settings.

Change your default search settings in Firefox

Learn how to change search settings in Firefox, such as your default search engine and whether or not search suggestions are displayed.

How to set the home page

Learn how to change what page you see when you first start Firefox, click the home button or open a new window.

Manage my default search engines in Firefox for Android

Firefox for Android lets you add, remove and change your default search engine. Learn to manage your search engines with just a few taps.

Multi-Account Containers

Add Container tabs to Firefox with the Multi-Account Containers add-on, to separate your work and personal browsing.

Recover lost or missing Bookmarks

If your bookmarks have disappeared, it may be possible to recover them. Learn why bookmarks may seem to be missing and how to get them back.

Export Firefox bookmarks to an HTML file to back up or transfer bookmarks

This article explains how to export your bookmarks to an HTML file, which can be used as a backup or for importing into another web browser.

Tips for assessing the safety of an extension

Here are a few tips for assessing the safety of a third party extension.

Turn picture-in-picture mode controls on and off

How to hide the picture-in-picture controls

Customize items on your Firefox New Tab page

Learn how to customize different items on your Firefox New Tab page.

Allow or block media autoplay in Firefox

Firefox prevents media from playing automatically on websites you visit, unless you grant permission. Learn more about this feature.

Thunderbird and Gmail

Thunderbird can be set up to work seamlessly with Google's Gmail. Messages will be synchronized between your local version of Thunderbird and web-based Gmail.

Compacting folders

This article explains how Thunderbird stores messages on a disk drive and why it is necessary to periodically compact (purge).

Add-ons in Firefox for iOS

Why Firefox add-ons are unavailable for Firefox on iOS.

Restore bookmarks from backup or move them to another computer

Learn how to restore your bookmarks from the automatic backups that Firefox creates, save and restore your own backups, and move bookmarks to another computer.

How to set up Firefox Sync in Firefox for Android

How to enable sync on Firefox for Android to sync your bookmarks, credit cards, history, logins and open tabs across your devices.

Manage your extensions using the extensions button in the toolbar

This article describes the new extensions button and how to manage your extensions and their permissions directly from the Firefox toolbar.

Automatically fill in your address on web forms

Manage your settings for automatically filling out your address on web forms.

The difference between IMAP and POP3

Thunderbird gives users the choice between using IMAP or POP3. This documentation will explain the major differences between these protocols.

Bookmarks Toolbar - Display your favorite websites at the top of the Firefox window

Learn how to use the Bookmarks toolbar in Firefox for quick access to often-used bookmarks.

Signatures

This article explains how to create and use custom signatures (text or images that are automatically appended to messages).

Compact mode workaround in Firefox

Learn about a workaround to activate compact mode, if you need to. This feature isn't supported and we still recommend using normal mode.

Restore previous session - Configure when Firefox shows your most recent tabs and windows

Firefox can restore windows and tabs that were open the last time you used it. Learn how to use and configure it.

Message threading in Thunderbird - keep messages grouped by conversation

Threading is a useful way of displaying message list in Thunderbird with your messages grouped in tree structures by conversations. Here's how to enable it.

JavaScript settings and preferences for interactive web pages

This article describes what JavaScript is and how to allow or block it on certain websites.

Add the Search bar to your Firefox toolbar

You can search the Web from the address bar or from the New Tab page. You can also add a separate Search bar to Firefox. Learn how.

Legacy browser support extension for Windows

Add-ons and older versions of Firefox ESR may enable your users to run legacy add-ons and view websites that require Internet Explorer.

Import settings and data into Thunderbird for Android

How to import email settings from K-9 and Thunderbird for Android

Setting Firefox as the default browser does not work - What to do

Learn how to make sure Firefox is the default browser if setting that option didn't work, or it got changed by another program.

Font size and zoom - increase the size of web pages

Zoom is a feature which allows you to increase or decrease either the size of a web page or the size of the text. This article explains how it works.

How to disable the Enterprise Roots preference

How to disable the Enterprise Roots preference to fix TLS connection errors caused by antivirus software, without compromising security.

Use Firefox in Full Screen mode

The Full Screen feature lets you expand the Firefox browser for the current page to fill up your whole screen. This article explains how to turn it on and off.

Open Firefox automatically when you start your computer

Enable Firefox to launch automatically when Windows starts, providing quicker access to your browser and enhancing your browsing experience.

Use the sidebar to access tools and vertical tabs

How to use the updated sidebar introduced in Firefox version 136, to access multiple tools and to turn on vertical tabs.

Control whether Firefox automatically fills in forms

Firefox can remember what you've entered in forms on web pages. This article explains how to auto-fill this info for you or how to prevent it being filled in.

Usernames and passwords are not saved

Firefox has a password management feature to store usernames and passwords for logging in to websites. Learn why logins might not be saved.

Sync bookmarks, tabs, history and passwords on Android

Sync bookmarks, history, open tabs and logins on your Android devices. Learn how to sign in to your Mozilla account.

Add or remove a search engine in Firefox

This article explains how to add or remove the search engines that Firefox uses.

About Picture-in-Picture in Firefox

The Picture-in-Picture feature allows you to pop videos out of their webpage, so you can watch while continuing to work in other tabs.

Access AI chatbots in Firefox

Using AI chatbots is optional. Learn more about the providers you can choose, how to remove the shortcut and what to keep in mind when using AI chatbots.

An extension changed my New Tab page or home page

View and disable extensions or add-ons that change the new tab page or home page.

Customize Date and Time formats in Thunderbird

How to customize date and time formats in Mozilla Thunderbird using regional settings or override preferences.

Use Firefox in another language

How to display Firefox in a different language.

How do I restore my tabs from last time?

This article explains the different options you have for opening the tabs and windows you had open the last time you used Firefox.

Manage optional permissions for Firefox extensions

Learn how you can manage optional permissions for extensions in the Firefox Add-ons Manager.

Getting Started with the Thunderbird main window (Supernova and newer)

For Supernova TB115 & newer, an overview of the Thunderbird Mail window, explaining the Folder Pane, Message List Pane, Header Pane, Message Pane, & Today Pane.

Gmail and Thunderbird for Android

How to use gmail and gmail with oauth2 with Thunderbird for Android and K-9.

Profile Manager - Create and remove Thunderbird profiles

Thunderbird stores your personal information and settings in a profile folder. Learn to work with different profiles on Thunderbird.

How do I use the Firefox spell checker?

Firefox's spell checker streamlines writing by auto-detecting errors, offering quick fixes, and with custom dictionary additions for flawless text.

Import login and password data from a file

Starting in Firefox version 116, you can import login and password information from a ''.csv'' file. Learn How.

Why does Mozilla disable some add-ons from running in Firefox?

Add-ons that violate Mozilla's add-on policies or jeopardize user safety and privacy may be restricted or blocked from running in Firefox.

Manage file types and download actions in Firefox

Learn how Firefox handles files with different content types and how to change what Firefox does when you click on or download a file.

How do I change to the desktop view in Firefox for Android?

This article explains how to get the desktop view of websites in Firefox for Android.

How to change the Thunderbird layout

Thunderbird contains three layout options for you to choose from to best fit your preference.

Use bookmark folders to organize your bookmarks

Firefox allows you to group your bookmarks into folders to organize them by topic or task, etc. This article explains how to organize your bookmarks this way.

Import Bookmarks from an HTML file

This article explains how you can take bookmarks saved in an HTML file and add them to your Firefox bookmarks.

Import Bookmarks and other data from Microsoft Edge

Firefox lets you import bookmarks and other data Microsoft Edge. This article gives you step-by-step instructions for getting it done.

Use multiple profiles in Thunderbird

Thunderbird saves personal information such as messages, passwords and user preferences in a "profile". This article describes how to use multiple profiles.

How do I change my DNS settings?

This article will show you how to change your DNS settings on Mozilla VPN and why you might want to do that.

Cannot remove an add-on (extension or theme)

This article describes how to uninstall an extension or theme that can't be removed normally. This includes problematic toolbars and search bars.

Scan QR codes in Firefox for iOS

Learn about the QR code reader in Firefox for iOS.

Recommendations from Firefox

This article describes why and how extension recommendations are made, including how to turn off recommendations.

Control audio or video playback with your keyboard

This page explains the technical documentation on how to control media in Firefox by using the Media Session API.

Setup your email account for using End-To-End Encryption

To use End-To-End Encryption with Thunderbird, you must prepare your own keys or certificates in account settings. This article explains what to do.

Change the fonts and colors websites use

This article describes how to customize the way you see websites by choosing font styles and colors that will override those used by the websites.

How to restore a browsing session from backup

There are special situations where a browsing session may be lost. This article will show you how to recover your lost session.

Switch from POP to IMAP account

This article explains how to switch from a POP to an IMAP account in Thunderbird.

How to opt out of studies on Firefox for iOS

Here's how you can opt in or out of studies on Firefox iOS

Install the Pocket extension in your browser

How to install the Pocket save extension for your web browser

Installing an Add-on in Thunderbird

Add-ons add functionality to Thunderbird or change its appearance. Learn how to install add-ons to Thunderbird.

Manage notifications in Firefox for Android

Learn how to control which notifications you receive from Firefox for Android.

Change website appearance settings in Firefox

Change Firefox settings to adjust the appearance of the websites you visit.

Change the program used to open email links

Learn how to change the email program that Firefox opens when you click a “mailto” link, or use the “Email Link” and “Email Image” features.

Export bookmarks to Safari

You can export your Firefox bookmarks for use in other browsers. This guide shows you how to export your Firefox bookmarks and import them into Safari.

Display the Thunderbird menus and toolbar

The menu items File, Edit, View, etc. are located in the menu bar. This article will help you restore a missing menu bar.

Importing Safari data into Firefox

Import data from your Safari browser into Firefox. You must enable Full Disk Access on macOS version 10.14 (Mojave).

Getting started with Thunderbird for Android

How to start using Thunderbird for Android.

FAQ Changing IMAP to POP

If your mail server supports both IMAP and POP, Thunderbird will use IMAP by default. Use these instructions to manually configure a POP account.

How to reset the default user agent on Firefox

Learn how to reset your Firefox "user agent" so that websites can detect your correct browser and version and work the way they should.

Disable or re-enable Pocket for Firefox

The Pocket save and recommendations features are included with Firefox by default. Learn how to disable or remove Pocket from Firefox and how to re-enable it.

Set Firefox Focus as default browser on Android

How to set Firefox Focus as your default browser so you can use it to open links by default.

Manage extension shortcuts in Firefox

Manage your add-on shortcuts through the Manage Preferences menu in about:addons.

Move the navigation bar to the top or bottom of the app in Firefox for Android

Firefox for Android gives you the option to move the navigation bar to the bottom or top of the app if desired.

Get started with Thunderbird

Get started with Thunderbird for webmail users

IMAP Synchronization

IMAP stands for the Internet Message Access Protocol. It enables a mail client (such as Thunderbird) to access messages stored on a mail server. It is more modern and fully featured than POP (Post Office Protocol), which is the other major protocol for accessing mail messages. Most email providers now support IMAP. To see whether your account uses IMAP or POP, check the Server Settings page in the Account Settings.

Message List Columns

This article explains how to configure the columns that Thunderbird displays in message lists.

How to Subscribe to News Feeds and Blogs

An introduction to RSS feeds, and instructions on how to use them in Thunderbird.

Customize Firefox using policies.json

Cross-platform policy support can be implemented using a JSON file called policies.json.

Search suggestions in Firefox Focus for iOS

How to turn search suggestions on or off in Firefox Focus.

Manage Firefox updates

Learn about automatic updates for Firefox deployments and how to ensure that the latest security patches are applied and all features are available.

How to opt out of studies on Firefox Focus for Android

Here's how you can opt out of studies on Firefox Focus for Android.

Tab preferences and settings

Learn how to customize tab settings in Firefox to enhance your browsing experience.

Customize your New Tab page to hide or display content

Learn how to show or hide content on your Firefox New Tab page, such as changing which sections to display or showing a blank new tab page.

Scan QR codes in Firefox for Android

Learn how to use the QR code reader in Firefox for Android.

Manage saved passwords in Firefox for iOS

View, edit or delete saved passwords in Firefox on your iPad, iPhone or iPod touch.

Choose display languages for multilingual web pages

How to choose your preferred languages for multilingual web pages.

Dedicated profiles per Firefox installation

Different Firefox installations now use a separate profile to store your bookmarks, passwords and other settings. Learn more.

Change your two-step authentication device for your Mozilla account

What to do if you have two-factor authentication (2FA) setup on your account and need to migrate to a new device or phone.

Set Firefox for Android to open links in native apps

Learn how you can set Firefox for Android to automatically open links in native apps.

Get started with the Mozilla VPN extension

The VPN extension complements the main VPN app, offering flexible controls to secure your browsing activity and customize VPN settings without altering your device-wide VPN protection.

Configuration Options for Accounts

Learn about the Account Settings window including server settings, identities, signatures, and more.

Customize the Firefox home screen

How to customize the default Firefox home screen

Advanced panel - System, network, updates, and other advanced settings in Thunderbird

Learn about the Advanced panel of the Thunderbird Options/Preferences window including scrolling, system integration, network, update, certificates, etc.

Customize Firefox using Group Policy (Windows)

Firefox supports setting policies via Active Directory as well as using Local Group Policy.

Protect your container tabs with Mozilla VPN

Mozilla VPN encrypts your connection so that third parties can't track your online activity. Learn how to add this protection to Containers.

Firefox for Enterprise Kiosk mode

Kiosk mode locks down Firefox in order to protect the kiosk from users. Learn more.

How to pin and unpin Firefox from the taskbar on Windows 10 and Windows 11

Learn how to pin and unpin Firefox from the taskbar in Windows 10 and Windows 11.

Domains to allow for Firefox

This article is primarily for Firefox for Enterprise. It lists domains that should be allowed by your firewall or other software, so Firefox works correctly.

A program on your computer interferes with the Mozilla VPN extension

You got a message saying that “A program on your computer may be causing issues with the Mozilla VPN extension”. Here's how you can fix that.

How to search IMDB, Wikipedia and more from the address bar

Learn how to use Smart Keywords to search a specific website directly from the Firefox address bar.

Reset Firefox preferences to troubleshoot and fix problems

When troubleshooting Firefox problems, resetting user preferences can help pinpoint the issue. This article explains how to do this.

Find and install extensions on Firefox for Android

There are several extensions that you can install to add features to Firefox. Learn how to find, install and manage these add-ons to Firefox for Android.

Thunderbird add-ons - frequently asked questions

Add-ons are extensions and other additions that add new functionality to Thunderbird or change its appearance.

Config Editor

Using the config editor to view or edit Thunderbird preference settings.

Use the Firefox Sidebar to access bookmarks, history and synced tabs

The Firefox Sidebar feature lets you access your bookmarks, history and synced tabs conveniently at the click of a button.

Access your add-ons with a Mozilla account

The addons.mozilla.org (AMO) site is using Mozilla accounts to offer a more integrated experience across all Mozilla services and products.

Autocomplete settings in the Firefox Focus address bar

Get to websites faster with URL autocomplete.

Set up Certificate Authorities (CAs) in Firefox

Learn how to set up certificate authorities (CAs) for your organization in Firefox for Enterprise.

Pocket sponsored stories on new tabs

Pocket occasionally partners with select publishers and brands to deliver sponsored stories on the Firefox New Tab page. Learn more.

Manage Firefox with Microsoft Endpoint Manager (Intune)

How to manage Firefox Enterprise with Microsoft Endpoint Manager (Intune).

Auto-close open tabs in Firefox for Android

Learn how Firefox for Android can automatically close tabs after one day, one week or one month.

HTTPS-Only Mode in Firefox Focus for Android

You can change your preferences to HTTPS-Only Mode in Firefox Focus for Android, version 97 and above.

Hide Pocket recommendations in Firefox

How to hide Recommended by Pocket stories on the Firefox home and new tab page.

Add alt text to images in your PDFs using Firefox

Image alt text is crucial for document accessibility. Learn how to create it manually or with our Firefox AI-powered feature for PDF files.

Thunderbird Android Telemetry

This article describes controlling data that may be collected by Thunderbird for Android, to help improve performance and stability.

Changes to toolbars and window sizes are not saved

If Firefox doesn't remember changes you've made to toolbar customizations or to browser window size or position, this article has solutions.

Firefox doesn't save web form entries

Firefox's autocomplete feature lets you save and reuse text field entries in web forms. If you're no longer able to auto-fill your forms, follow these steps.

HTML5 audio and video in Firefox

Firefox can handle audio and video content on web pages and can open some media files. Learn about supported formats and managing playback.

Enable or disable search engines on Firefox for iOS

Learn how to enable or disable search engines from Firefox in your iPhone or iPad.

Customize Firefox Home on iOS

Firefox Home on your iOS device displays your shortcuts, your library, recently visited tabs, recently saved bookmarks and Pocket article recommendations.

Built-in themes in Firefox - alternative to complete themes

How to enable Firefox's built-in themes.

Add search engines in Firefox Focus for iOS

Add your favorite search engines.

Customize Firefox using AutoConfig

How to use AutoConfig files to set and lock preferences that are not covered by Firefox policies.

Add trusted websites to your allow list in Firefox Focus

Add frequently visited websites to your tracking protection allow list.

Assign shortcuts to search engines

How to search faster with search shortcuts.

Playing videos in Firefox for Android

Firefox for Android gives you lots of options for playing video and audio on your phone, including background playback and auto-play settings.

Add a Firefox widget to your Home screen

Learn more about how to add a Firefox widget to your Home screen.

OpenPGP Recipient Alias Configuration

How to set up and use the OpenPGP recipient Alias feature in Thunderbird.

Multi-Hop - Encrypt your data twice for enhanced security while using Mozilla VPN

Add an extra layer of protection to your data using multiple servers on Mozilla VPN.

How file downloads are handled in Firefox

This article describes changes to how downloads are handled and answers some frequently asked questions.

How do I quit Firefox for Android?

Add the Quit option to your menu to automatically delete your browsing history and close all tabs every time you exit the app.

Hyperlinks in Messages Not Working

When clicking hyperlinks in email, your default web browser should open and display their content. Learn why that may fail and why links may not be clickable.

How to Customize the New Mail Sound

Learn how to customize the sound that plays when a new email message is received.

Add a search engine to Firefox Focus for Android

Add a search engine or search results page to Firefox Focus for Android.

Autocomplete web addresses in the URL bar in Firefox Focus for iOS

Turn URL autocomplete on or off.

Privacy panel - Remote content and cookie settings in Thunderbird

Learn about the Privacy & Security options in Thunderbird (mail/web content, cookies, passwords, junk/spam detection, data collection, antivirus, certificates).

How to replace Google Assistant with a Firefox search

Make Firefox search replace Google Assistant.

Access hidden tabs in Firefox

Firefox lets you know when there are tabs hidden in the background so you can access them easily.

Firefox starts automatically when I restart Windows

If Firefox was open when Windows shut down, Firefox may reopen automatically the next time you start Windows. You can disable this feature.

Install themes to change the look of Thunderbird

A theme is a type of add-on which changes the visual appearance of Thunderbird. Learn how to find, install, and manage themes within Thunderbird.

Getting started with the Thunderbird main window

An overview of the Thunderbird Mail and Newsgroups window, explaining the Folder pane, Message List pane, Header pane, Message pane, and Today pane.

Enforce policies on Firefox for Enterprise

Types of policy engines for Firefox for Enterprise.

Drag and Drop errors with Firefox Launcher Process enabled and Windows UAC disabled - How to Fix

How to fix Firefox drag-and-drop errors when running Windows as Administrator with UAC disabled and the Launcher Process enabled.

Collections in Firefox

Learn how to use the Collections feature.

Turn on/off saved logins, login sync and login autofill in Firefox for Android

Learn how to save, sync and access your logins in Firefox for Android

How to move the search bar in Firefox for iOS

The search bar in Firefox for iOS will appear at the bottom of the screen by default. However, you can choose to move it to the top of the screen instead.

Safari Integration in Firefox iOS

Firefox Focus for iOS allows users to integrate Firefox Focus' features to Safari. Some users may have to take extra steps to enable Safari integration.

Firefox Suggest for Mobile

Firefox Suggest provides personalized website suggestions as you type in the address bar.

Block links from opening in external apps

Learn how to stop links from automatically opening in external applications.

Disable VPN protection for a specific website

The Mozilla VPN extension allows you to choose the websites you wish to protect and the ones you don't. This article describes how it works.

Manage the VPN extension preferences

After configuring VPN preferences for different websites, you may want to review them to confirm they meet your expectations. Follow these steps to do so.

Manage your Monitor notifications

Monitor helps you stay informed about data breaches and data broker sites through your notification settings. You can control the updates you receive to ensure they are relevant to your needs.

Manage marketing data settings in Firefox for Android

Learn what marketing data Firefox collects on Android, how Mozilla uses it, and how to manage or opt out of marketing data sharing.

Block and unblock websites with parental controls on Firefox

This article explains how to block websites or filter website content in Firefox that may be offensive or inappropriate for children.

How to fix preferences that won't save

This article tells you how to fix issues where Firefox can't save some or all of the preference settings that you try to change.

Change the default language of Firefox for Android

Learn how to change the default language on Firefox for Android.

Using Dark Theme in Firefox for Android

You can change the look of your Firefox app at any time by selecting between Light and Dark mode.

How to disable or change the Thunderbird start page

Change the Thunderbird start page to any webpage, or set it to a blank page.

Make Thunderbird the Default Mail Client

If Thunderbird is specified as your system's default email application, it will integrate with other applications (such as word processors and web browsers).

Thunderbird makes unrequested connections

Thunderbird sometimes automatically connects to the Internet. These connections are for routine maintenance, update and security purposes.

How to Customize Toolbars

This article explains how to customize the position and contents of Thunderbird toolbars.

Manage saved passwords in Firefox for Android

Learn how to view, edit, delete, and sync saved logins in Firefox for Android. Manage passwords and enable autofill for a seamless experience.

Voice input in Firefox for Android

Learn how to use the voice input feature to speak into the address bar instead of typing text.

Change the default language on Firefox for iOS

How to switch to another default language on Firefox for iOS.

Set Firefox as the default browser for iOS

In iOS 14+ you can now change your default browser. Learn how to change your default browser or other options for older versions.

Set a homepage in Firefox for iOS

How to set a URL for your home page, accessed from the Homepage option in the menu.

Set Firefox Lite as your default browser

Set Firefox Lite as your default browser.

Turn search suggestions on or off on Firefox for iOS

How to turn search suggestions on or off.

Print simplified, clutter-free pages in Firefox

Firefox lets you print pages in a simplified format that strips away clutter like buttons, ads, and background images. Learn more.

Security panel - Junk, scam, antivirus, and password settings in Thunderbird

Learn about the Security panel of the Thunderbird Options/Preferences window including junk mail control, scam detection, antivirus integration, and passwords.

How to add the translate add-on to Firefox

Seamlessly translate webpages in Firefox.

Facebook Container isn't working

What to do if Facebook Container doesn't work.

How is Facebook Container different from Multi-account Containers?

The difference between Facebook Container and Multi-Account Containers

Firefox Focus main Menu

Use the menu button to share pages, open pages in other browsers, copy URLs or find text on a page.

Manage policies on macOS desktops

Starting with Firefox 64 and Firefox ESR 60.4, Firefox supports configuration files on macOS.

Where can I find a list of policies for Firefox for Enterprise?

Where to find policies for Windows, Mac and Linux.

Hide Pocket in your Firefox New Tab page

Learn how to remove or restore Pocket recommended stories on the Firefox New Tab page.

Enable auto-fill on your iPhone or iPad

Enabling auto-fill will let Firefox Lockbox enter your log-ins on your apps for you so you don’t have to keep entering them.

Enable auto-fill on your Android devices

Enabling auto-fill will allow Firefox Lockwise to enter your login credentials across all your apps so that you don’t have to keep manually entering them.

Dangerous directories

Some system folders are not allowed when setting Thunderbird storage location as they cause issues.

Edit top sites on Firefox Lite home screen

Learn how to pin, add and remove top sites on your Firefox Lite home screen.

Remove the Other Bookmarks folder from the Bookmarks Toolbar

How to remove the Other Bookmarks folder from the Bookmarks Toolbar in Firefox

What information does Mozilla VPN collect?

Learn about what information Mozilla VPN collects.

Text Encoding no longer available in the Firefox menu panel

The Firefox menu panel no longer has a Text Encoding submenu. It is still available in the Menu bar View menu and as an optional toolbar button.

Automatically fill in credit card information on Firefox for Android

Automatically save and fill in your payment method information on Firefox for Android.

Set Firefox as your default browser from the notification panel on Android

Set Firefox as your default browser from the notifications drawer.

Exclude applications from Mozilla VPN protection

Exclude applications from Mozilla VPN protection

Change your theme in Firefox Focus for iOS

Firefox Focus for iOS has built-in light and dark themes so you can customize its appearance. You can also choose to have the theme set by your system.

My default search engine changed after updating Firefox

After updating Firefox, you may have noticed that your default search engine has been changed. Learn more.

Install the Firefox Relay extension on Google Chrome

You can install the Relay extension from the Chrome Web Store to generate and reuse masks in Google Chrome.

Import settings and data into Thunderbird

With Thunderbird's import tool, you can import settings and data from a variety of sources including Thunderbird profiles, other applications or files.

Quick actions in the Firefox search bar

This article refers to the new Quick actions feature available in the Firefox address bar drop-down menu.

Manage your Mozilla account newsletter and email preferences

Change your email preferences to receive the emails that are of most interest to you, or to unsubscribe from email communications.

How do I block phone calls or texts to my Relay Phone mask?

Learn how to block phone calls or text messages forwarded to your phone mask with Firefox Relay

Upgrading from an older version of Thunderbird

This article will help you upgrade old versions of Thunderbird to the latest version.

Why aren’t my add-ons working on some websites?

Learn why some Firefox extensions have been disabled on certain websites, how to manage these limits, and explore alternative solutions.

Unified Toolbar

Intro to the Unified Toolbar and how to customize the buttons for the different toolbars for: Mail, Address Book, Calendar, Tasks, Chat and Settings "Spaces."

Autofill Credit Cards in Firefox for iOS

Streamline your online shopping with Firefox for iOS Credit Card and Payment Method Autofill. Learn more.

userChrome.css and .js and userContent are unsupported

userChrome.css, userChrome.js, userContent.css and userContent.js are unsupported because they can break at any time and are difficult to troubleshoot.

Enabling the Pocket Share extension in iOS

Enable the Pocket Share Extension on iOS to easily save content from various apps using the native share menu.

New in Thunderbird for Android version 8

Introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird for Android version 8.

Notifications in Thunderbird

This allows Mozilla to push important, time-sensitive notifications to users. These notifications are scheduled based on version, OS and locale.

How will DNS work when using the VPN extension?

Learn how your DNS (Domain Name System) settings work while using your Mozilla VPN extension.

Restore the default Smart Bookmarks Folders

Learn how to restore the default Most Visited or Recent tags "Smart Bookmarks" folders if you deleted them.

What to do if you can't download or save files

If you can't download or save files with Firefox, this article explains the steps to take to fix this problem.

Share data with Mozilla to help improve Firefox

The Telemetry feature sends us performance and usage data to help measure how Firefox behaves in the real world and improve it. Learn more.

Closing multiple Tabs - option to disable warning

Firefox warns when multiple tabs are closed, there is an option to disable this warning if not required

How to disable the built-in PDF viewer and use another viewer

Firefox has a built-in PDF viewer. We'll show you how to disable it and use another PDF viewer, like Adobe Reader, instead.

Creating a Newsgroup Account

Thunderbird can be used to read messages from and write messages to Usenet newsgroups.

Names but no Email Addresses are Displayed

I can only see the message sender's name, not address!

Configuration Options for Identity

This page describes Thunderbird's configuration options that affect your identity.

Configuration Options for Tags

This page describes Thunderbird's configuration options as they relate to tagging messages.

Configuration Options for Attachments

This page describes Thunderbird's configuration options for attachments.

Certificates

Block a sender

How to Install and Use another Language in the Dictionary on Thunderbird

How to install and use additional language dictionaries on Thunderbird.

Installing Thunderbird on Ubuntu Linux

Add Search Engine to Open Search

Open Search enables Thunderbird users to search various websites from within Thunderbird. This article describes how to add additional websites to the Open Search interface.

Instant Messaging and Chat

As of Thunderbird 52.x, Thunderbird supports instant messaging and chat using IRC, XMPP, Twitter, and Google Talk

Installing and Using another Language in the Dictionary

Get help with Firefox Developer Edition

Firefox now has a version built especially for developers. Learn where to get help.

Uninstall Firefox for Android extensions

How to uninstall Firefox for Android add-ons/extensions

Maildir in Thunderbird

Optional support for Maildir allows you to store email as individual files, unlike the default single file format. Learn about Maildir in Thunderbird.

Thunderbird and Logjam

Thunderbird no longer supports 512 bit (so called US export) keys for TLS connections.

Save passwords in Firefox for Android

How to enable or disable saved logins in Firefox for Android.

Add Firefox to the Today view on your iOS device

Add the Firefox widget to the Today view on your iPhone, iPad or iPod touch to open new tabs or access copied links quickly.

Re-enable multi-process support disabled by Windows utilities

Some Windows accessibility tools might turn off Firefox's multi-process support. Here's how to re-enable it.

Change the default email program in Firefox for iOS

Change your default mail app in Firefox for iOS.

New Tab settings in Firefox for iOS

Customize your New Tab settings.

Remove a search engine in Firefox Focus for Android

Remove a search engine in Firefox Focus for Android.

File system paths on Linux are always treated as UTF-8

On Linux, the profile path is required to be valid UTF-8. Names of downloaded files are encoded in UTF-8 regardless of glibc and glib settings.

Add shortcuts to websites on your home screen

Add shortcuts to websites on your Android's home screen so that you can access them quickly. Learn more.

Block cookies in Firefox Focus for Android

Block cookies in Firefox Focus for Android.

Change themes in Firefox for iOS

Learn how to switch between light and dark themes on Firefox for iOS.

Feed reader replacements for Firefox

Firefox's built-in support for web feeds and Live Bookmarks ended in December 2018 with version 64. Learn more and find alternatives.

How to use collections on addons.mozilla.org

How to create, edit, share, and delete a collection on addons.mozilla.org.

Debugging policy issues

This article will help you figure out problems with policies not applying.

Unable to install add-ons (extensions or themes) in Thunderbird

This article describes various reasons that would cause an add-on not to be able to be installed and what you can do to fix the issue.

Change Firefox Lite to Night Mode

Learn how to turn on Night mode in Firefox Lite to change its brightness while using the app to reduce eye strain.

Disable high contrast mode in Firefox

How to disable high contrast mode if it's causing problems on some web pages.

Privacy settings in Firefox for Enterprise

How to disable features for minimize information sent to Mozilla.

See active policies on Firefox for Enterprise

How to see what policies you have active on a desktop computer.

Managing policies on Linux desktops

How to manage policies on Linux desktops.

Will policies I set work if users already installed Firefox?

Policy support for Firefox is implemented using Group Policy.

Make Firefox for Enterprise the default browser

Learn how to configure the computers in your domain to use Firefox for Enterprise as the default browser.

Review installed extensions

Reviewing the extensions you have installed periodically can make it harder for malicious extensions to put your security and privacy at risk.

How to fix Pocket login issues

Learn how to add an exception for Pocket in Firefox, to prevent being prompted to sign in to Pocket when saving to the site.

Set Firefox as your default browser on Lockwise for iOS

Change your default browser in Firefox Lockwise for iOS.

Firefox Browser welcome pages - helping you get more from Firefox products and services

When you open Firefox after reaching a certain user milestone, you’re shown a Firefox Browser welcome page in a new tab. Learn more.

Customize Firefox on macOS using configuration profiles

On macOS, Firefox supports customizing policies with a properties list (.plist) file that can be converted to a configuration profile. Learn more.

Using Dark Theme in Firefox for iOS

Firefox for iOS can automatically switch to a dark or light theme to match your device’s settings if you have iOS 13.

My privacy settings were changed from Custom to Standard

If your Custom settings match the settings in Standard, you will be switched back to Standard. This will not affect your settings.

Tab context menu

Explore the features available in the tab context menu in Firefox, including options for managing and organizing your tabs.

Change Firefox Lite themes

You can change the wallpaper color to customize your home screen in Firefox Lite.

Firefox Lite enhanced search with Awesome bar

Learn more about the awesome bar's features in Firefox Lite.

What's new in Firefox Lite (version 2.5)

See what's in the latest Firefox Lite release.

Turn push notifications on or off in Firefox for iOS

How to enable or disable push notifications for Firefox on your iPad, iPhone or iPod.

Grant camera access to Firefox for Android

How to grant camera access so Firefox can scan a QR code.

Use Web Apps with Firefox for Android

Learn more about Web apps and how to use them with Firefox for Android.

End of support for Adobe Flash

Like other browsers, Firefox has ended support for Adobe Flash. Learn about the details here.

Mozilla Voice Server Proxy Retiring

Mozilla is ending official support for the Mozilla Voice Proxy Server and its related projects. Learn more about the retirement of server and extensions.

Unable to uninstall add-ons (extensions or themes)

This article describes how to uninstall an extension or theme that can't be removed normally.

How to configure Close Tab warnings in Firefox

Learn how to enable or disable the close tab warning that shows when you're about to close multiple tabs, in Firefox version 94 and above.

Set Firefox Focus as the default browser for iOS

Learn how to set Firefox Focus as your default browser on iOS.

View recently saved bookmarks from your homepage on Firefox for iOS

View your recently saved bookmarks and reading list items on your homepage in Firefox for iOS.

View bookmarks on your home screen

You can access your bookmarks and recent searches from your Firefox for Android home screen.

View articles recommended by Pocket on your Firefox for Android homepage

You can view articles and topics recommended by Pocket on your Firefox for Android homepage.

Change your theme in Firefox Focus for Android

Firefox Focus for Android has built-in light and dark themes so you can customize its appearance. You can also choose to have the theme follow your device theme.

Personalize Firefox with colorways

Personalize your browsing experience with Colorways themes for Firefox, created in partnership with an industry color specialist.

The language of the websites I visit changes when I turn Mozilla VPN on - What to do

This article explains what to do if the language of the websites you visit changes when you use Mozilla VPN

Install the Firefox Relay extension on Firefox for desktop

Extensions customize and add functionalities to Firefox. Add the Firefox Relay extension to generate a mask when you register on websites.

View articles recommended by Pocket on your Firefox for iOS homepage

You can view articles and topics recommended by Pocket on your Firefox for iOS homepage.

Choose your opening screen for Firefox for iOS

Choose what you see when you return to the Firefox for iOS app.

How to opt out of studies on Firefox Focus for iOS

Firefox Focus runs studies to make sure users are getting the best experience when they test new features.

Add a search engine to Firefox klar for Android

Add a search engine or search results page to Firefox Klar for Android.

Remove a search engine in Firefox Klar for Android

Remove a search engine in Firefox Klar for Android.

Autocomplete settings in the Firefox Klar address bar

Get to websites faster with URL autocomplete.

Change your wallpaper in Firefox for iOS

You can change the wallpaper to customize your homepage in Firefox for iOS.

Change your wallpaper in Firefox for Android

You can change the wallpaper to customize your homepage in Firefox for Android.

Receive only important emails sent through your masks with Firefox Relay Premium

With Firefox Relay Premium, you can block promotional emails and receive only important emails in your inbox.

Enable light or dark mode in MDN

MDN is displayed in light mode by default. You can enable dark mode and switch back to light mode at any time on any page.

Change site permissions in Firefox Focus for Android

You can change site permissions in Firefox Focus for Android without changing your default settings.

Change site permissions in Firefox Klar for Android

You can change site permissions in Firefox Klar for Android without changing your default settings.

Recommended Firefox privacy and security settings for families

Firefox lets you customize privacy and security settings so you and your family can browse safely online. Learn more.

Automatically fill in your address on web forms in Firefox for Android

Manage your settings for automatically filling out your address on web forms in Firefox for Android

Mozilla VPN message center

Check the message center in the navigation bar for notifications about new features and subscription updates.

How to disable the Firefox Relay autofill icon on online fields and websites

The Relay integration with Firefox Password Manager makes a shortcut icon appear next to email fields on websites. Learn how to disable it.

Site Permission Add-ons

Sites can ask to install permission add-ons that modify Firefox’s default security behavior to give them extra privileges. Learn more.

What should I do if I'm redirected to the Firefox Relay FAQ when clicking a link within an email?

After enabling the Remove email trackers Firefox Relay option, certain links in forwarded emails may redirect to our FAQ page. Learn more.

X-Mouse Button Control in Firefox 110

Learn about an issue with X-Mouse Button Control in Firefox 110 for Windows.

Install the Firefox Relay extension in Firefox for Android

Start generating email masks from your mobile device. This article provides step-by-step instructions for downloading and setting up the Relay extension in Firefox for Android.

How do I change my Privacy features?

Learn how to activate and deactivate the Mozilla VPN Privacy features and how it can interact with your custom DNS settings.

Turn off ads on MDN Plus

This article shows MDN Plus subscribers the steps to enjoy an ad-free experience.

How to automatically label your new email masks

This article shows how the Relay add-on helps you create masks with website-based labels.

What languages is Mozilla VPN available in?

See the languages Mozilla VPN is currently available in.

In what languages is Firefox Relay available in?

In what languages is Relay available in? With a commitment to inclusivity, Relay caters to a global audience through multiple languages to accommodate users from all corners of the globe. Our mission is to create a user-friendly digital environment that ensures safety and accessibility for all.

Getting started with Pocket for iOS

Learn how to sign up, log in, and navigate key features in Pocket for iOS.

Customizing your reading settings in Pocket

Pocket lets you customize your reading preferences when an article opens in Article View.

Change your language in Pocket

This article explains how to change the display language of Pocket.

Importing your links into Pocket

Pocket offers tools to import URLs that you’ve saved elsewhere into Pocket.

Adding a shortcut to Pocket on your Windows desktop

Learn how to add Pocket to your Windows 10 Start Menu, Taskbar, and get offline access via Latermark app.

Keyboard shortcuts in Pocket for Web

Keyboard shortcuts available in Pocket for Web.

What permissions does Pocket for Android require and why?

Learn about Pocket Android permissions: Internet access, storage use, Google login, and privacy policy details.

Customize your reading experience in Pocket Premium

On Pocket for Android and Pocket's website, you can create your own perfect reading experience by adjusting your display settings.

Thunderbird Matrix Chat FAQ

FAQ for the Matrix Chat feature in Thunderbird

How to delete an email mask

Learn how to delete a mask from Firefox Relay. Once you delete a mask you can no longer use it or reactivate it.

Global Privacy Control in Firefox for Android

How to make Firefox for Android advise websites that you visit not to sell or share your browsing information.

Address autofill on Firefox

Experience the seamless Address Autofill in Firefox iOS, simplifying address entry on websites.

Enable or disable Local Network Access on iOS

LAN Bypass allows you to control whether or not your device can access devices on the local network while the VPN is on. Examples of these can be your network printer, your smart TV, AirDrop and CarPlay.

Multiwindow support on iPad for Firefox

Learn how to use Firefox in multiple windows on your iPad for better multitasking and productivity.

Choose your preferred PDF viewer in Firefox

Learn how to set a different PDF viewer for downloaded files in Firefox instead of using the built-in viewer.

Choose which browser opens Pocket web content on your Android

Pocket for Android lets you choose which browser to open web content with when viewing articles. Follow these steps to select your preferred browser for a smoother reading experience.

Configure push email for Thunderbird for Android

How to set up push email notifications for selected folders for Thunderbird for Android

Change your location for a specific website

The Mozilla VPN extension allows you to set a particular location through which you want to access a given website. Learn about this feature here.

What to do if another extension interferes with the Mozilla VPN extension

If you're using the Mozilla VPN extension and encounter a message about other extensions interfering, follow this steps to fix it.

Customize your wallpapers

Firefox allows you to customize your Firefox New Tab page with a selection of wallpapers. This is how.

Wrong home page opens when I start Firefox - How to fix

Learn how to restore your home page if a third-party software vendor changes it so that their page always opens when you launch Firefox.

Make Firefox the default browser on Android

This article explains how to set Firefox as your default browser on your Android device.