How to find out which of the tabs in firefox eats the most CPU? And in general, who is to blame and what to do?

Question

JavaScript

Got firefox consuming 100% cpu. There is a suspicion that this is JavaScript from one of the open sites, I want to know which one. And in general, if the page is in an inactive/background tab, why does it need to run some scripts? Why can't it be done that if the tab is inactive, then all scripts stop - period. And you can whitelist exclusions for gmail, etc.

Answer 1

Please think a little before asking a question. Doesn't it seem logical to you that you can find out the answer to this question by the method of exceptions?
As for suspicions about js - you turn off the scripts and look.
As for the rest - completely turn off the pictures, js and close the tabs. Better buy a stronger car, I have ff on a mediocre laptop and a hundred tabs can easily pull.

Answer 2

https://support.mozilla.org/en/kb/firefox-vyzyvaet...
use tab grouping to manage pages

Answer 3

I know that in FF you can look at what consumes memory, but nothing about the processor
about: memory