"chrome uses 2gb of ram"

these days individual _tabs_ are using multiple gb of ram.

Don't know about chrome, but Firefox has an about:memory special page that will let you know which tabs are using the most ram. Of all the sites I use, youtube is the only culprit. When I am done watching a video, I use the about:memory to kill the associated process (doesn't destroy the tab (in case I want to come back to it)). I assume it is all the javascript cruft.