None of them have Flash because I've got Flashblock off, and that's after a refresh. The vast majority of them do have animated GIFs, but personally I wouldn't mind at all if it stopped playing animated GIFs when I, you know, can't see them. In fact I'd prefer it if it did, because then I'd still have my CPU.

And it shouldn't be burning CPU on housekeeping when I'm not doing anything. Just sloppy coding. :(

Plugins, btw, are almost entirely Javascript - it is possible to add DLLs but almost nobody does that. So they don't really need to be compiled against a profiler to track memory usage, just add hooks to the javascript interpreter to tag allocated memory.