macbook heating

<i>Locking this thread.</i><br><i>Continued here: [[/questions/1225571]]</i><br> i use clear firefox quantum last version. and my mac too hot when i use it. too hot. i turn off all i can. i turn of multiproccecing but didnt help... the mac is getting hot without opened tabs! only i run firefox it gets hot. but safari didnt... can i do something? why firefox do this to mac users? (or eny users of slow pc)