Rated 4 out of 5 stars
I'd love it if you could incorporate either an "idle" button or auto-detect when the browser is minimised and move CPU intensive tabs into TMT cache to free up CPU for gamers that need it for smooth gameplay in those apps. Perhaps for detecting such tabs you could use the code from https://addons.mozilla.org/en-US/firefox/addon/9954 with the method described in a review of it:
"Once XUL Profiler presents the callgraph page, I click to "See" the "Source" of the bar with the greatest "Time" usage. A new window pops up with the source, and the offending URL is right at the top in the title bar. I find that URL website amongst the tabs I have open and close down the tab. When my Task Manager shows that my CPU usage has dropped, then I know I have freed up my system and killed the culprit."