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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.
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.
About permission request messages for Firefox extensions
Learn about permission requests when adding extensions to Firefox. Get details on each request for a clearer understanding.
View site information with Page Info
Learn what the Firefox Page Info window shows about a site and what settings you can change directly.
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.
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.
Update Firefox to the latest release
Firefox automatically updates itself by default, but you can always do a manual update. Learn how to update Firefox on Windows, Mac, or Linux.
Fix error “Website will not allow Firefox to display the page.”
Learn why Firefox may block a page embedded by another site, and what you can do to open it.
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.
How to install Firefox on Windows
This article describes how to download and install Firefox on Windows.
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.
Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
Access AI chatbots in Firefox
Using AI chatbots is optional. Learn more about the providers you can choose, how to remove the shortcut and what to keep in mind when using AI chatbots.
Thunderbird and Junk / Spam Messages
This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").
Enhanced Tracking Protection in Firefox for desktop
Enhanced Tracking Protection in Firefox automatically protects your privacy while you browse.
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.
Unload tabs to reduce system memory usage in Firefox
Learn how Firefox’s unload tabs feature helps reduce memory usage on your computer.
Use the sidebar to access tools and vertical tabs
How to use the updated sidebar introduced in Firefox version 136, to access multiple tools and to turn on vertical tabs.
Customize items on your Firefox New Tab page
Learn how to customize different items on your Firefox New Tab page.
Windows 10 warns me to use a "Microsoft-verified" app
Windows 10 may interrupt your Firefox install with a “Microsoft-verified apps” warning. Firefox is safe to install, so choose “install anyway”.