Limit non selected tab use of resources. I.E. No audio/video processing
My browsing generally consists of center mouse button clicking of topics that interest me, after reading a page I will close it and go onto another page.
I suggest any back ground page that had objects that are trying to output audio or video be placed into suspend mode.
I.E. I know I have too many tabs open when my laptop starts muttering at me or the CPU fan kicks in.