Someone said they don't like FF because it shakes... and I was all like WTF?  Never seen that... been using it forever and never seen this happen!  So I googled it.

http://forums.mozillazine.org/viewtopic.php?t=68163

Just 1 result - you can google it yourself and get more - it's apparently a well-known problem... amongst those that have it at least.  1st thing to try is to disable your bookmarks toolbar.  Looks like the general consensus is that it's a conflict between firefox and firefox themes and/or windows themes.  I don't know exactly since I can't make it happen on mine :)
I've never used the bookmarks toolbar... the fewer buttons and bars I need on my browser the better IMO.[img:d297c52339]http://videosean.gotgeeks.com/i/FFSS.jpg[/img:d297c52339]