If your Mac hardware supports it, the best "update" isn't a new browser—it’s a new OS.
: Ensure you haven't accidentally downloaded a newer version. Check the version by selecting About Firefox in the menu. "Up to Date" Messages firefox download for mac 10105 upd
If you find that Firefox 78 is sluggish or still incompatible with websites you need, consider these legacy browsers: If your Mac hardware supports it, the best