Firefox has a help page about their Recommended Extensions program: https://support.mozilla.org/en-US/kb/recommended-extensions-program https://support.mozilla

Firefox has a help page about their Recommended Extensions program: https://support.mozilla.org/en-US/kb/recommended-extensions-program https://support.mozilla.org/en-US/kb/recommended-extensions-... It's exactly what you're asking for, a badge showing that Mozilla "staff security experts" have carefully reviewed the extension to ensure that it is free of malicious or unsafe code. The extension must also be effective at what it does, offer a good user experience, and be regularly updated.