Your question is extremely ambiguous. What makes you think that Firefox is not working well? If you are talking about Firefox for smartphones '''you are on the incorrect forum.''' This forum is for Firefox on desktop operating systems (Windows, macOS/Mac and Linux). If your audio is not working in Firefox [https://support.mozilla.org/en-US/questions/1428925 this thread may help.] If it's running slow, [[Reset Firefox preferences to troubleshoot and fix problems|consider refreshing Firefox.]]