Privacy and security | Firefox Help (original) (raw)

Learn how to protect your privacy and secure your data.

Firefox Terms of Use FAQ

Frequently asked questions about Firefox Terms of Use.

Firefox, Firefox for Android, Firefox for iOSFirefox, Firefox for Android, Firefox for iOS Last updated: 6/17/25

Common Myths about Private Browsing

Learn more about common misconceptions about Private Browsing in Firefox.

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Use built-in VPN in Firefox

Learn how to activate and use the built-in VPN feature in Firefox to protect your browsing.

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Avoid and report Mozilla tech support scams

Mozilla does not provide telephone support and does not charge for software downloads, upgrades or technical help. Learn more.

Firefox, Firefox for Android, Firefox for iOS,...Firefox, Firefox for Android, Firefox for iOS, Thunderbird Last updated: 2/3/25

Third-party trackers

Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.

FirefoxFirefox Last updated: 10/26/24

Add Firefox Relay to the Firefox password manager

Integrate Firefox Relay into the password manager to conveniently generate or reuse email masks from within email fields. Learn how.

Firefox, Firefox RelayFirefox, Firefox Relay Last updated: 11/4/24

Insecure connection password warning in Firefox

Firefox will show you a "connection is not secure" warning message when a website login page is insecure and information could be stolen.

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Sponsors on the home page and 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.

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Enhanced Tracking Protection in Firefox for desktop

Enhanced Tracking Protection in Firefox automatically protects your privacy as you browse.

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Firefox users now have access to Total Cookie Protection by default. Find all you need to know about it in this article.

FirefoxFirefox Last updated: 5/20/25

Configure DNS over HTTPS protection levels in Firefox

DNS over HTTPS (DoH) is a recommended feature that enhances privacy. Learn more about the DoH protection levels you can configure in Firefox settings.

FirefoxFirefox Last updated: 3/27/25

Private Browsing - Use Firefox without saving history

Firefox Private Browsing is great for viewing websites without saving things such as cookies, temp files and a history of the pages you visit.

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Manage remote improvements settings in Firefox

How to manage remote improvement settings in Firefox version 148 and above.

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How do I set up Sync on my computer?

Use a Mozilla account to sync your bookmarks, history, passwords, add-ons and open tabs with another device, profile or version of Firefox.

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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.

FirefoxFirefox Last updated: 8/22/25

Global Privacy Control

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

FirefoxFirefox Last updated: 3 weeks ago

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

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

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Pop-up blocker settings, exceptions and troubleshooting

Learn how to block or allow pop-ups in Firefox and how third-party redirect blocking enhances your browsing protection.

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Learn what information Firefox sends to websites about your location and how to use and manage location-aware features of your browser.

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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.

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How do I turn on the Do Not Track feature?

This article describes the “Do Not Track” feature in Firefox 134 and below, that lets you tell websites not to track your browsing behavior.

FirefoxFirefox Last updated: 3/4/26

Firefox security features warning on Linux

Create an AppArmor profile for Firefox on Linux.

FirefoxFirefox Last updated: 3/5/25

How does built-in Phishing and Malware Protection work?

Firefox contains built-in Phishing and Malware Protection to help keep you safe online. This article explains how they work.

FirefoxFirefox Last updated: 1/12/24

Trackers and scripts Firefox blocks in Enhanced Tracking Protection

Learn how Firefox blocks common trackers and harmful scripts, to reduce the ability of third parties to collect data about your browsing.

FirefoxFirefox Last updated: 3 weeks ago

HTTPS-Only Mode in Firefox

Learn more about HTTPS-Only Mode which forces all connections to websites to use HTTPS.

FirefoxFirefox Last updated: 3 weeks ago

Secure website certificate

Websites can present Firefox with a certificate to identify themselves. Find out how Firefox checks the authenticity of the sites you visit.

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Search suggestions in Firefox

Learn more about how search suggestions work in Firefox.

FirefoxFirefox Last updated: 3/7/26

Protect privacy while using Web Authentication

Learn about Web Authentication, a powerful anti-phishing technology.

FirefoxFirefox Last updated: 12/1/24

Manage technical and interaction data collection settings in Firefox

Learn what technical and interaction data Firefox collects, how it’s used, and how to manage or opt out on desktop, Android and iOS.

Firefox, Firefox for Android, Firefox for iOSFirefox, Firefox for Android, Firefox for iOS Last updated: 2 weeks ago

Delete browsing, search and download history on Firefox

Learn what information is stored in your Firefox history and how to clear all or part of it if you are using a public or shared computer.

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Firefox connection upgrades - HTTP to HTTPS

Firefox upgrades connections from HTTP to HTTPS to enhance security and protect your data. Learn about server- and browser-initiated upgrades and how they work.

Firefox, Firefox for AndroidFirefox, Firefox for Android Last updated: 7/18/25

Automatically trust third-party root certificates

Root certificates are the backbone of the security system that underpins HTTPS web traffic. Firefox, like most web browsers, includes a pre-installed set of trusted root certificates.

FirefoxFirefox Last updated: 11/21/23

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

Learn why some Firefox add-ons might not work on certain websites and how to manage those extensions to enhance your browsing experience.

FirefoxFirefox Last updated: 6/24/25

SmartBlock for Enhanced Tracking Protection

SmartBlock lets pages load more fully, with less breakage – all while keeping those tracking scripts blocked.

FirefoxFirefox Last updated: 4/13/25

Control personal device and local network permissions in Firefox

Learn why Firefox now asks permission before allowing sites to access your personal device or local network.

FirefoxFirefox Last updated: 1/26/26

Manage daily usage ping data collection settings in Firefox

Learn how to manage daily usage ping data collection settings in Firefox.

Firefox, Firefox Focus, Firefox for Android,...Firefox, Firefox Focus, Firefox for Android, Firefox for iOS Last updated: 3 weeks ago

Crash reports in Firefox for Desktop

Learn about backlogged crash reports, how Firefox handles them and how to manage the setting to allow or prevent automatically sending crash reports

FirefoxFirefox Last updated: 12/16/25

Troubleshoot Firefox issues caused by malware

Malware is software designed to invade a computer without your knowledge. We'll explain common symptoms, how to prevent it being installed and how to remove it.

FirefoxFirefox Last updated: 9/24/22

Use a Primary Password to protect stored logins and passwords

Setting a Primary (formerly "Master") password in Firefox is helpful if your share your computer with others. We'll explain how it works.

FirefoxFirefox Last updated: 4 days ago

Manage Enhanced Tracking Protection exceptions

Learn how to manage Enhanced Tracking Protection exceptions.

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Resist Fingerprinting

Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.

FirefoxFirefox Last updated: 11/25/25

Firefox DNS over HTTPS

DoH improves privacy by hiding domain name lookups from anyone lurking on public Wi-Fi, your ISP or others on your local network. Learn more.

FirefoxFirefox Last updated: 6/5/25

Learn how to use Firefox's screen sharing feature safely.

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Mozilla service providers and partners

Mozilla uses third-party service providers and trusted partners to help provide the Firefox desktop browser and related services. Learn what's shared and more.

FirefoxFirefox Last updated: 1/5/26

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

Firefox uses a padlock icon next to a website's URL to let you know your connection is encrypted. Click on the icon for more information.

FirefoxFirefox Last updated: 1 week ago

How to use Firefox containers

This article explains how to use Firefox containers with the Multi-Account Containers extension, to organize your online activities.

FirefoxFirefox Last updated: 8/8/25

Mixed content blocking in Firefox

Firefox automatically blocks insecure or mixed content from secure web pages. We'll explain what that means.

FirefoxFirefox Last updated: 3/3/26

Oblivious HTTP (OHTTP) explained

One of the technologies used in Firefox to enhance online privacy is Oblivious HTTP (OHTTP). Learn what it is, how it works and how it helps protect your data.

Firefox, Firefox for Android, Firefox for iOSFirefox, Firefox for Android, Firefox for iOS Last updated: 3/5/26

Remove a synced device from your Mozilla account

Disconnect a device from your Mozilla account and stop syncing its data.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 10/23/23

How Firefox securely saves passwords

Learn how Firefox securely saves your passwords.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 10/28/25

Autofill logins on Firefox

Firefox lets you control whether or not to autofill your logins and passwords.

FirefoxFirefox Last updated: 2/19/24

Understand Encrypted Client Hello (ECH)

Firefox version 118 introduced a security enhancement called Encrypted Client Hello (ECH), enabled by default in Firefox 119. Learn more.

FirefoxFirefox Last updated: 7/15/25

Manage marketing data settings in Firefox for Desktop

Learn how Firefox Desktop collects marketing data, how Mozilla uses it, and how you can manage or opt out of marketing data sharing.

FirefoxFirefox Last updated: 3/6/25

How to stop Firefox from making automatic connections

Learn about the various reasons why Firefox makes automatic connections to the Internet and how you can stop it from doing so if you wish.

FirefoxFirefox Last updated: 7/24/25

Manage your logins with the Firefox Password Manager

Manage your saved logins and passwords on desktop Firefox with the built-in password management feature.

FirefoxFirefox Last updated: 1/24/24

Certificate contains the same serial number as another certificate

Why Firefox may show you a Secure Connection Failed error when you try to access the configuration page for your router and what to do.

FirefoxFirefox Last updated: 9/2/25

How do I choose what information to sync on Firefox?

Learn how to select what information (bookmarks, add-ons, browsing history and other data) to share across your devices with Firefox Sync.

Firefox, Firefox for Android, Firefox for iOS,...Firefox, Firefox for Android, Firefox for iOS, Mozilla Account Last updated: 1 week ago

Firefox can be used by several people on a single computer. Learn the basic protections to prevent others form accessing your private data.

FirefoxFirefox Last updated: 1/30/26

Change your Mozilla account password

How to change your Mozilla account password if you detect strange activity on your account.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 5/19/25

I found a fake Firefox update

What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.

FirefoxFirefox Last updated: 6 days ago

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.

Firefox, Firefox for Android, Firefox for iOS,...Firefox, Firefox for Android, Firefox for iOS, Mozilla Account Last updated: 2/6/25

Disable Firefox Sync

Learn how to turn off Firefox Sync if you’d like to use your Mozilla account without syncing data such as, bookmarks, history and tabs.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 4/19/25

Site Permissions panel

If you allow or block permissions for a website, the address bar will show a Permissions icon that opens the Permissions panel. Learn more.

FirefoxFirefox Last updated: 1 week ago

Firefox privacy and security features

Check Firefox's most advanced features and settings for safe, private online browsing.

FirefoxFirefox Last updated: 10/22/24

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.

FirefoxFirefox Last updated: 8/11/22

Disable Firefox Sync on a lost phone or tablet

This article describes what you should do to prevent someone from accessing your passwords on a lost device with Firefox Sync.

Firefox, Firefox for Android, Firefox for iOS,...Firefox, Firefox for Android, Firefox for iOS, Mozilla Account Last updated: 2/6/25

How to stay safe on the web

There are many scams, viruses and other dangers out in the Web. Take these simple steps to protect your computer and personal information.

Firefox, Privacy and SecurityFirefox, Privacy and Security Last updated: 5/14/25

How do I know the status of my sync?

The Mozilla account toolbar icon tells you when you are signed in and syncing Firefox data. You can personalize it with your own avatar.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 10/19/25

DNS over HTTPS (DoH) FAQs

We have outlined a list of FAQs here that you may find helpful while getting up to speed with all that DNS over HTTPS (DoH) has to offer.

FirefoxFirefox Last updated: 12/2/24

Disable password saving in Firefox

If you’re using a shared device and don’t want Firefox to remember your passwords, you can change your preferences in Firefox settings.

FirefoxFirefox Last updated: 1/23/24

Site Information panel

The Site Information panel in Firefox tells you about a website's connection security and identity. Learn more.

FirefoxFirefox Last updated: 5 days ago

How Firefox Sync keeps your data safe even if TLS fails

Firefox Sync encrypts your data before it ever leaves your device, and ensures that the password to unlock this encryption is never transmitted to the server.

Firefox, Mozilla AccountFirefox, Mozilla Account Last updated: 9/18/25

Primary Password is replacing Master Password

Primary Password is replacing Master Password. Learn more about why we are making this change.

FirefoxFirefox Last updated: 9/5/25

Telemetry collection - Windows default browser trends

This article explains one example of how Firefox collects and uses telemetry data with the Default Browser Agent Windows scheduled task.

FirefoxFirefox Last updated: 3/5/25

Learn about Enhanced Tracking Protection and Total Cookie Protection in Firefox, and how to troubleshoot and report possible site breakage.

FirefoxFirefox Last updated: 10/11/24

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.

FirefoxFirefox Last updated: 3/5/25

You can use your existing Google or Apple ID to sign up for a Mozilla account. Learn more.

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Data Loss Prevention

Seeing the DLP icon in Firefox? Here’s what it means and how it helps protect your data.

Firefox, Firefox for EnterpriseFirefox, Firefox for Enterprise Last updated: 11/5/24

HTTPS-First upgrades to secure connections

From version 136, Firefox implements HTTPS-First and always attempts to connect securely. If a secure connection fails it falls back to an insecure connection.

FirefoxFirefox Last updated: 1/30/25

Harmful add-on protection

If you have installed an add-on that triggers the opening of a known malicious website, Firefox will block it to protect you.

FirefoxFirefox Last updated: 2/12/26

Create secure passwords to keep your identity safe

Choosing more secure passwords will help keep your identity safe on the internet. Learn how to create secure, easy-to-remember passwords.

FirefoxFirefox Last updated: 5/14/25

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

FirefoxFirefox Last updated: 3/7/25