I would also love a simple indicator of which tabs are 'busy' consuming cycles or generating garbage, so I know which tabs to kill first to get back to acceptable performance. (Perhaps even just a rough indicator of how many setTimeout()s are originating from a page would be enough.)
I wish there was a simple way to suspend all open tabs. I really have no need to refreshing disquis-comments or some crazy scripts that track my mouse pointer to generate heat maps.
I even tried to write a little chrome extension which injects a content script into every open tab, which calls settimer to get the highest timer-id and kills all timers with ids from 1 to this id.
But for some reason it didn't work.
...as I meant to imply by replying under an FF issue.
But speaking of Chrome, I'd prefer the activity indicator in the tabs themselves... mapping the Task Manager names to my many tabs distinguishable only by not-necessarily-unique favicons is a pain.
