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Make Firefox your default browser on Windows
Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
Common Myths about Private Browsing
Learn more about common misconceptions about Private Browsing in Firefox.
Use built-in VPN in Firefox
Learn how to activate and use the built-in VPN feature in Firefox to protect your browsing.
Server Not Found - Troubleshoot connection problems
If you can't connect to a website, you may see the Server Not Found error message. Learn how to troubleshoot and fix this error.
Secure connection and security warning error pages in Firefox
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Firefox Terms of Use FAQ
Frequently asked questions about Firefox Terms of Use.
Use widgets on your Firefox New Tab page
Learn how to manage tasks, focus time, and check the weather using Firefox’s experimental productivity widgets.
About Add-on Badges
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
What Windows 10 end of support means for Firefox users
Learn how Firefox will continue supporting Windows 10 after Microsoft ends its updates, and discover the steps Mozilla recommends to keep your browsing experience secure.
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.
Private Browsing on Firefox for Android
Private Browsing on your mobile device is great for viewing websites incognito – without saving information about the sites you visit.
Troubleshoot time-related errors on secure websites
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.
Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
Thunderbird and Junk / Spam Messages
This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").
Pinned Tabs - keep favorite websites open and just a click away
Pinned Tabs allow you to keep your favorite web apps open and just a click away. This article explains how to use them.
Fix "The bookmarks and history system will not be functional" error message
This article explains what to do if you see the error message “The bookmarks and history system will not be functional” when you start Firefox.
Pocket has shut down - What you need to know
More information about the end of support for Pocket.
Captive portal detection
Description of how Firefox detects captive portal networks.
Understanding the risks of installing self-hosted extensions
Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.
Customize Firefox controls, buttons and toolbars
Firefox offers many ways to make your browsing experience your own. Learn how to customize the browser’s controls, buttons, and toolbars.