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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.
Make Firefox your default browser on Windows
Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
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.
Manage Firefox profiles
Learn about the new Firefox profile manager and how to create, customize, manage and switch profiles that you use for different purposes.
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.
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”.
View site information with Page Info
Learn what the Firefox Page Info window shows about a site and what settings you can change directly.
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.
Common Myths about Private Browsing
Learn more about common misconceptions about Private Browsing in Firefox.
Password Manager - Remember, delete and edit logins and passwords in Firefox
Firefox's password management feature securely stores your usernames and passwords. Learn how to save, view, manage and protect your logins.
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.
Change Firefox options, preferences and settings
Learn how to access and adjust Firefox settings, including privacy, startup behavior, downloads and more.
Third-party trackers
Learn about cross-site (third-party) cookies that collect information to track your browsing, which are used on many websites.
Customize items on your Firefox New Tab page
Learn how to customize different items on your Firefox New Tab page.
Thunderbird and Junk / Spam Messages
This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").
Manage Firefox data collection and privacy settings
Manage Firefox’s data collection settings, including technical and interaction data, crash reports and the daily usage ping.
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.
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.
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.