Customize settings and preferences
Make Firefox yours through customization settings and add-ons
Add-on Badges
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
Personalized extension recommendations
Learn more about how Firefox occasionally recommends extensions you may find interesting and how to opt-out.
Tips for assessing the safety of an extension
Here are a few tips for assessing the safety of a third party extension.
Firefox options, preferences and settings
Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Automatically fill in credit card data on Web forms
Manage credit card autofill settings in Firefox version 81 and above.
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.
Does Firefox share my location with websites?
Learn what information Firefox sends to web sites about your location and how to use and manage location-aware features of your browser.
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.
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.
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.
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.
Firefox's performance settings
Firefox automatically uses settings that work best with your computer. You can always change these settings.
Recommendations from Firefox
This article describes why and how extension recommendations are made, including how to turn off recommendations.
Make Firefox your default browser
How to make Web links open in Firefox automatically by setting it as the default browser on your computer.
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.
Pop-up blocker settings, exceptions and troubleshooting
Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.
Multi-Account Containers
Add Container tabs to Firefox with the Multi-Account Containers add-on, to separate your work and personal browsing.
Recovering important data from an old profile
If you need to create a new Firefox profile, find out how to recover your old Firefox data such as bookmarks, history and passwords.
How do I use the Firefox spell checker?
Firefox automatically checks your spelling as you type. Available options include adding dictionaries and removing words added by accident.
View PDF files in Firefox or choose another viewer
You can view PDF files in Firefox with the built-in viewer. You can also choose a different viewer or set Firefox to always ask. Learn more.
Back up and restore information in Firefox profiles
Firefox stores your personal information and settings in a profile folder. Learn how to back up and restore this important data.
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.
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.
Add or remove a search engine in Firefox
This article explains how to add or remove the search engines that Firefox uses.
How to change your default browser to Firefox on Windows
Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
Choose display languages for multilingual web pages
How to choose your preferred languages for multilingual web pages.
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.
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.
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.
Use Firefox in another language
How to display Firefox in a different language.
Access hidden tabs in Firefox
Firefox lets you know when there are tabs hidden in the background so you can access them easily.
Manage extension shortcuts in Firefox
Manage your add-on shortcuts through the Manage Preferences menu in about:addons.
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.
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.
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.
Search with the Firefox address bar
Learn how the address bar makes it easy to search the Web, find bookmarks or pages you visited before, use search engines and more.
How to use collections on addons.mozilla.org
How to create, edit, share, and delete a collection on addons.mozilla.org.
Importing Safari data into Firefox
Enable Full Disk Access on macOS version 10.14 (Mojave) or higher, so that you can import data from your Safari browser into Firefox.
End of support for Adobe Flash
Like other browsers, Firefox has ended support for Adobe Flash. Learn about the details here.
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.
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.
Assign shortcuts to search engines
How to search faster with search shortcuts.
Disable high contrast mode in Firefox
How to disable high contrast mode if it's causing problems on some web pages.
Configuring Networks to Disable DNS over HTTPS
At Mozilla, we believe that DNS over HTTPS (DoH) is a feature that everyone should use to enhance their privacy. Learn more.
Firefox Notes status
Learn more about the discontinuation of Firefox Notes on November 1, 2020.
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.
