Firefox 7 Beta uses less memory | Ubergizmo: www.ubergizmo.com/2011/08/firefox-7-beta
(snippet from the article)
We do know that Mozilla has just released Firefox 6, but here we are with Firefox 7 Beta – and this particular version (also, we did cover whispers of Mozilla mulling over whether to do away with version numbers) is said to be the first to implement Memshrink. Just what does Memshrink bring to the table? It will be able to reduce Firefox’s memory usage by get this – nearly 50%. Now that is certainly something worth looking into, and if such low memory usage levels can be achieved even in a beta, imagine what the full version will be able to do.