Privacy and security

Learn how to protect your privacy and secure your data.

In English

Common Myths about Private Browsing

Firefox Terms of Use FAQ

Use built-in VPN in Firefox

Insecure connection password warning in Firefox

Private Browsing on Firefox for Android

Third-party trackers

Avoid and report Mozilla tech support scams

Enhanced Tracking Protection in Firefox for Android

Add Firefox Relay to the Firefox password manager

Does Firefox share my location with websites?

Firefox Password Manager - Alerts for breached websites

Private Browsing - Use Firefox without saving history

Sponsors on the home page and New Tab page

Global Privacy Control

How do I set up Sync on my computer?

Mobile - Manage Firefox data collection and privacy settings

Choose a strong password

How to set up Firefox Sync in Firefox for Android

Firefox security features warning on Linux

Configure DNS over HTTPS protection levels in Firefox

Manage marketing data settings in Firefox for Android

Manage remote improvements settings in Firefox

How do I turn on the Do Not Track feature?

Remote Content in Messages

Pop-up blocker settings, exceptions and troubleshooting

HTTPS-Only Mode in Firefox for Android

Trackers and scripts Firefox blocks in Enhanced Tracking Protection

Introducing Total Cookie Protection in Standard Mode

Delete browsing, search and download history on Firefox

Manage technical and interaction data collection settings in Firefox

How to manage your camera and microphone permissions with Firefox

HTTPS-Only Mode in Firefox

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

Secure website certificate

About private browsing in Firefox for iOS

How does built-in Phishing and Malware Protection work?

Protect privacy while using Web Authentication

Use a Primary Password to protect stored logins and passwords

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

Firefox connection upgrades - HTTP to HTTPS

Control personal device and local network permissions in Firefox

Unable to find the built-in VPN in Firefox

Manage daily usage ping data collection settings in Firefox

Configure DNS over HTTPS protection levels in Firefox for Android

Troubleshoot Firefox issues caused by malware

SmartBlock for Enhanced Tracking Protection

Is Mozilla VPN free?

I found a fake Firefox update

Mozilla Monitor - Frequently asked questions

Resist Fingerprinting

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

Introduction to End-to-end encryption in Thunderbird

Mixed content blocking in Firefox

Autofill logins on Firefox

Password Manager - Remember, delete and change passwords in Thunderbird

Crash reports in Firefox for Desktop

How do I choose what information to sync on Firefox?

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

Manage marketing data settings in Firefox for Desktop

Share browser windows or your screen with sites you trust

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

Protect your Thunderbird passwords with a Primary Password

Clear your browsing history in Firefox for Android

Firefox DNS over HTTPS

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

Clear browsing history in Firefox for iOS

Site Information panel

Enhanced Tracking Protection in Firefox for iOS

How Firefox securely saves passwords

Enhanced Tracking Protection in Firefox for desktop

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

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

DNS over HTTPS (DoH) FAQs

Browsing history in Firefox - View the websites you have visited

Activate Firefox Relay - Mask your email address

Site Permissions panel

How do I report an issue with Firefox Relay?

How to use Firefox containers

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

How to stop Firefox from making automatic connections

Disable Firefox Sync on a lost phone or tablet

Remove a synced device from your Mozilla account

How do I know the status of my sync?

Protect your container tabs with Mozilla VPN

Mozilla service providers and partners

Disable Firefox Sync

Automatically trust third-party root certificates

Thunderbird Mobile Telemetry

Oblivious HTTP (OHTTP) explained

Reset your Mozilla account password to protect your credentials

How do I share Firefox between people on a computer?

HTTPS-Only Mode in Firefox Focus for Android

Mozilla VPN - FAQ

Recommended Firefox privacy and security settings for families

How do I change my DNS settings?

Getting started with Thunderbird for Android

Certificate contains the same serial number as another certificate

Change your Mozilla account password

Add trusted websites to your allow list in Firefox Focus

Manage your logins with the Firefox Password Manager

How Firefox Sync keeps your data safe even if TLS fails

Thunderbird Telemetry

OpenPGP in Thunderbird - HOWTO and FAQ

Use Web Apps with Firefox for Android

Use labels to keep your masks organized in Firefox Relay

Install the Firefox Relay extension on Firefox for desktop

Safari Integration in Firefox Focus for iOS

Firefox privacy and security features

Disable password saving in Firefox

Microsoft OAuth Authentication and Thunderbird in 2026

OpenPGP in Thunderbird for Android - How To

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

How does Firefox for Android use the permissions it requests?

How to stay safe on the web

Set up a passcode and Face ID in Firefox for iOS

Suspicious activity on my Mozilla account

Keep Private Browsing tabs open after exiting Firefox

Firefox Focus for Android - Frequently asked questions

Tracking Protection on Firefox Focus for iOS

Change your two-step authentication device for your Mozilla account

Turn on Mozilla VPN on your Android device

Create an email mask through Firefox Relay

Primary Password is replacing Master Password in Thunderbird

OpenPGP Recipient Alias Configuration

Firefox Relay - Email and Phone masks

Mask your phone number with Relay Phone Masking

How to automatically label your new email masks

Privacy-Preserving Attribution

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

Lock your private tabs on Firefox for Android

Manage Enhanced Tracking Protection exceptions

Control personal device and local network permissions on Firefox for Android

Block and unblock websites with parental controls on Firefox

Create secure passwords to keep your identity safe

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?

Digitally Signing and Encrypting Messages

How Thunderbird’s scam detection works?

How can I digitally sign and encrypt emails?

Thunderbird and Logjam

Search suggestions in Firefox

Send usage data on Firefox mobile browsers

About Firefox Desktop Attribution

Open a new private tab in Firefox Focus for Android

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

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

Compatibility with Exploit protection on Windows

Telemetry collection - Windows default browser trends

Disable email forwarding - Stop receiving emails sent through your masks

Grant camera access to Firefox for Android

View and control data collected by Mozilla VPN

Exclude applications from Mozilla VPN protection

How do I reset Mozilla VPN?

Use Multi-Account Containers with Mozilla VPN

Usage Data Changes for Firefox for iOS and Android

What to do after you have subscribed to Mozilla VPN

What to do after a data breach

Quickly access previously generated masks

Total Cookie Protection and website breakage FAQ

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

How does Firefox for iOS use the permissions it requests?

Resolve breaches with Mozilla Monitor

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

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

How do I monitor multiple email addresses?

How do I change my Privacy features?

Understand Encrypted Client Hello (ECH)

Encrypted Client Hello (ECH) - Frequently asked questions

Relay Phone Masking FAQ

Global Privacy Control in Firefox for Android

Data Loss Prevention

Generate strong passwords in Firefox for Android

How Review Checker preserves user privacy

Why does Monitor show me in a data breach for a site I never signed up to?

HTTPS-First upgrades to secure connections

Manage daily usage ping data collection settings in Firefox Focus

Firefox for Android’s protection against fingerprinters

Understand unexpected script warnings in Firefox

Fix phone masking issues and protect voicemail privacy in Relay

Firefox Homepage Lift Studies

Harmful add-on protection

Use breach alerts in Firefox

Statistics for Firefox Homepage Sponsors

Troubleshoot network errors when TLS key logging is enabled

Explore by product

Explore by topic

Browse by product

Browse all forum threads by topic

Get help with

Search Support

In English