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You'll see a warning in Firefox for Android when you try to install unverified or unsigned add-ons. Learn more about add-on signing.
As of Firefox 68 this plugin will no longer be available for new installations of Firefox on Android. Mozilla is considering future options.
Some popular video websites have changed their settings on the server side so that videos will no longer play in the background.
If you're using Firefox on your Nexus 6 or Nexus 9, you might experience temporary issues with video and audio files. Learn how to fix them.
How to send a detailed crash report.
How to migrate your saved logins to the newest version of Firefox for Android when using a master/primary password.