a) You need to raise an issue then with Firefox team as that isn't something that Apple is at fault for. b) If your speakers sound bad then it could be dust or

a) You need to raise an issue then with Firefox team as that isn't something that Apple is at fault for. b) If your speakers sound bad then it could be dust or debris. Might want to unscrew your Mac and use a blower / vaccum cleaner on it.