We all know chrome is bit of memory hog. but since last update of both chrome and firefox I found that firefox is a major memory hog now. using 2 or 3 times that of chrome! First time since had machine my macbook air was unable to load word file I wanted to work on. Looked at the activity monitor and ram was in red! and 1.1GB swap. First time seen this, ok only got 4GB but still. Firefox with 2 or 3 tabs (cannot remember exactly now) one was this forum another was another forum and possibly owners club site for my car. It was using only just shy of 800MB ram. I killed firefox and worked the word file before trying firefox again. As i write this firefox has the mac forum and one car club forum open and 646MB used memory. Chrome has 4 tabs open, mainly google docs and 164MB in use. my ram guide is green as i write this though. This is really just an observation.