Rated 5 out of 5 stars

le PeaceByJesus ar Noll. 24, 2015 · buan-nasc

Does what it claims except it may not show all the load due to processes. Paste about:addons-memory in address bar and hit Enter.

But what is more needed is an ext. that will show the cpu load for each ext and each tab. There is one for the memory use of each tab. but not cpu.