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Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work?
Since the release of Firefox version 52 in March 2017, NPAPI plugins no longer load, except for Adobe Flash. Learn more about this change.
Enable and disable cookies that websites use to track your preferences
Websites store things like your preferences, login status, and trackers in "cookies" on your computer. Learn how to manage cookies in Firefox.
How to change your default browser in Windows 10
Learn how to make Firefox your default browser in Windows 10.
Secure connection failed and Firefox did not connect
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
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