My Windows 7 PC has only :-) 4Gb. I noted Firefox process takes as much as 2Gb alone. It is one single process. IE, Chrome, Opera have separate processes for each tab.
I have many tabs open and do not consider bookmarks menu as convenient as tabs.
Is there any browser/plugin/setting that frees memory for tabs that are not used for some time (not current)?
P.S. I'm using Windows 7 mostly. If for other Win versions / Linux browsers behave differently, please let me know.