Does anybody get the above when using the latest version of Firefox?
I have even run Firefox in 'safe mode' but it is still the same after several hours of browsing.
I don't think it's a memory leak though as Firefox usually keeps RAM usage between 100 Mb and 150 Mb which is supposed to be normal memory usage?
I have found that the only way to cure the problem is to shut it down and restart it.
While CPU usage is so high, opening and closing web pages is very slow so it isn't something that I can put up with, apart from the fact that my processor is working flat out which can't be beneficial to it due to the rising temperatures especially in the summer months!
I have the same version of FF. I have Adblock installed as well. My cpu usage is typically between 2-5% whilst browsing in FF except when I browse on ONE particular site which seems to be designed for viewing in IE (it also happens to be my most frequently visited site!!). On that site (strangely only part of it) I can get a cpu usage up to 45% and very occasionally a number of images delay in being rendered. As far as cache handling goes, there is a cache handling extension for FF which displays the used and total available RAM Cache and Disc Cache (at the foot of a web page) giving the option (right click) to clear one or both. This won't solve your problem but will hopefully demonstrate that it's not an inherently FF one. ;-))