Privacy and security

Learn how to protect your privacy and secure your data.

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Common Myths about Private Browsing

Firefox Terms of Use FAQ

Use built-in VPN in Firefox

Avoid and report Mozilla tech support scams

Insecure connection password warning in Firefox

Third-party trackers

Private Browsing on Firefox for Android

Enhanced Tracking Protection in Firefox for Android

Does Firefox share my location with websites?

Add Firefox Relay to the Firefox password manager

Enhanced Tracking Protection in Firefox for desktop

Sponsors on the home page and New Tab page

Firefox Password Manager - Alerts for breached websites

Pop-up blocker settings, exceptions and troubleshooting

Automatically fill in credit and debit card payment methods data on web forms

Configure DNS over HTTPS protection levels in Firefox

How do I set up Sync on my computer?

Delete browsing, search and download history on Firefox

How to manage your camera and microphone permissions with Firefox

Use a Primary Password to protect stored logins and passwords

Mobile - Manage Firefox data collection and privacy settings

About private browsing in Firefox for iOS

Firefox security features warning on Linux

How to set up Firefox Sync in Firefox for Android

How to use Firefox containers

Choose a strong password

Manage remote improvements settings in Firefox

HTTPS-Only Mode in Firefox for Android

Remote Content in Messages

How does built-in Phishing and Malware Protection work?

Manage technical and interaction data collection settings in Firefox

HTTPS-Only Mode in Firefox

Trackers and scripts Firefox blocks in Enhanced Tracking Protection

Manage marketing data settings in Firefox for Android

Secure website certificate

Troubleshoot Firefox issues caused by malware

Protect privacy while using Web Authentication

Manage daily usage ping data collection settings in Firefox

Search suggestions in Firefox

Introducing Total Cookie Protection in Standard Mode

Why are some add-ons not allowed on sites restricted by Mozilla?

Private Browsing - Use Firefox without saving history

Password Manager - Remember, delete and change passwords in Thunderbird

Mixed content blocking in Firefox

How do I tell if my connection to a website is secure?

SmartBlock for Enhanced Tracking Protection

Firefox connection upgrades - HTTP to HTTPS

Configure DNS over HTTPS protection levels in Firefox for Android

Mozilla Monitor - Frequently asked questions

Resist Fingerprinting

I found a fake Firefox update

Introduction to End-to-end encryption in Thunderbird

Manage marketing data settings in Firefox for Desktop

Manage Enhanced Tracking Protection exceptions

Automatically trust third-party root certificates

Crash reports in Firefox for Desktop

How do I choose what information to sync on Firefox?

How Firefox securely saves passwords

Is Mozilla VPN free?

Control personal device and local network permissions in Firefox

Clear your browsing history and other personal data on Firefox for Android

How to stop Firefox from making automatic connections

Clear your browsing history in Firefox for Android

Disable Firefox Sync

Autofill logins on Firefox

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

Recommended Firefox privacy and security settings for families

Unable to find the built-in VPN in Firefox

Protect your container tabs with Mozilla VPN

Mozilla service providers and partners

Site Permissions panel

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

Clear cookies and website data for a single domain in Firefox for Android

Instructions for obtaining a personal S/MIME certificate by creating a CSR

How do I share Firefox between people on a computer?

Share browser windows or your screen with sites you trust

Manage your logins with the Firefox Password Manager

DNS over HTTPS (DoH) FAQs

Turn on Mozilla VPN on your Android device

HTTPS-Only Mode in Firefox Focus for Android

Mozilla VPN - FAQ

Block and unblock websites with parental controls on Firefox

Protect your Thunderbird passwords with a Primary Password

Clear browsing history in Firefox for iOS

Change your Mozilla account password

Remove a synced device from your Mozilla account

Add trusted websites to your allow list in Firefox Focus

Browsing history in Firefox - View the websites you have visited

Disable password saving in Firefox

Use built-in VPN in Firefox for Android

Certificate contains the same serial number as another certificate

Site Information panel

Set up a passcode and Face ID in Firefox for iOS

Enhanced Tracking Protection in Firefox for iOS

Firefox DNS over HTTPS

How Firefox Sync keeps your data safe even if TLS fails

Change your two-step authentication device for your Mozilla account

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

Create an email mask through Firefox Relay

Safari Integration in Firefox Focus for iOS

How do I change my DNS settings?

Sign in to a Mozilla account using 3rd-party authentication

Privacy-Preserving Attribution

Oblivious HTTP (OHTTP) explained

Lock your private tabs on Firefox for Android

Hide your email using Firefox Relay on Android when signing up on websites

How to stay safe on the web

Digitally Signing and Encrypting Messages

Suspicious activity on my Mozilla account

Firefox Focus for Android - Frequently asked questions

How do I know the status of my sync?

Thunderbird Telemetry

Activate Firefox Relay - Mask your email address

Grant camera access to Firefox for Android

OpenPGP in Thunderbird - HOWTO and FAQ

Use Web Apps with Firefox for Android

Primary Password is replacing Master Password in Thunderbird

Use Multi-Account Containers with Mozilla VPN

Use labels to keep your masks organized in Firefox Relay

What to do after a data breach

Quickly access previously generated masks

Total Cookie Protection and website breakage FAQ

Firefox privacy and security features

Mask your phone number with Relay Phone Masking

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

Microsoft OAuth Authentication and Thunderbird in 2026

How does Firefox Focus for Android use the permissions it requests?

How does Firefox Focus for iOS use the permissions it requests?

How to automatically label your new email masks

Understand Encrypted Client Hello (ECH)

Relay Phone Masking FAQ

Thunderbird Mobile Telemetry

Reset your Mozilla account password to protect your credentials

Use breach alerts in Firefox

Troubleshoot network errors when TLS key logging is enabled

Create secure passwords to keep your identity safe

How do I turn on the Do Not Track feature?

Disable Firefox Sync on a lost phone or tablet

How does Firefox for Android use the permissions it requests?

Share data with Mozilla to help improve Firefox

How do I enable the Firefox OS phone lock?

Master password requested but not set Redirect 1

Certificates

Why does Thunderbird warn me that my server don't use encryption?

How Thunderbird’s scam detection works?

How can I digitally sign and encrypt emails?

Thunderbird and Logjam

Send usage data on Firefox mobile browsers

Keep Private Browsing tabs open after exiting Firefox

About Firefox Desktop Attribution

Open a new private tab in Firefox Focus for Android

Tracking Protection on Firefox Focus for iOS

Block cookies in Firefox Focus for Android

How do you use Adjust in Firefox?

Safe browsing in Firefox Focus

Tracking Protection in Firefox Preview

"Certificate cannot be trusted" warning in Kazakhstan

Telemetry collection and deletion

My privacy settings were changed from Custom to Standard

Compatibility with Exploit protection on Windows

Telemetry collection - Windows default browser trends

Disable email forwarding - Stop receiving emails sent through your masks

View and control data collected by Mozilla VPN

OpenPGP Recipient Alias Configuration

Exclude applications from Mozilla VPN protection

How do I reset Mozilla VPN?

Usage Data Changes for Firefox for iOS and Android

What to do after you have subscribed to Mozilla VPN

Install the Firefox Relay extension on Firefox for desktop

Firefox Relay - Email and Phone masks

Unsafe properties of OpenPGP keys might be ignored

What are email trackers and how can I block them with Firefox Relay?

Change site permissions in Firefox Focus for Android

Prerequisite for sending an encrypted email message

Thunderbird and OpenPGP Alias Keys

OpenPGP keys might be authentic or counterfeit

Disable credit card and payment method syncing across devices

Block deceptive content and dangerous downloads in Firefox

Relay Phone Masking - How long can I talk when I get a call?

How does Firefox for iOS use the permissions it requests?

How do I report an issue with Firefox Relay?

Resolve breaches with Mozilla Monitor

How do I monitor multiple email addresses?

How do I change my Privacy features?

Global Privacy Control

Encrypted Client Hello (ECH) - Frequently asked questions

Global Privacy Control in Firefox for Android

Data Loss Prevention

Using OpenPGP secret keys that advertise features that are not supported by Thunderbird

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