After update to FF12 - use of the cpu, slower and unresponsible

Nothing new - he had year ago and I couldn't fix it. Now, the issue is back. Firefox after about 10-20 minutes starts to work slow awfuly. Like, goes to a small number of new tabs makes good unresposnible a few seconds, the browser does not respond to what that it either, typing is 'invislbe' and only appears after a few seconds, then there frozen again for a while, as all scripts on the newly opened site needs good two seconds for himself. At that time, the uses of FF upward at more than 25% of my CPU (AMD Phenom 955 BE - 4 hearts, 3.2 GHz with 8 GB DDR3 RAM). And it also affects the whole system - everything is "stuttering" FF is doing. And it appeared that after the upgrade of FF11 to FF12 - similar thing that's happened in the last year, when I had to completely re - install the whole browser after update. And now, I'm new here, too tired to even think of clear all, completely new installation FF and import all the stuff.

I tried to reinstall soft, started in Mode safe mode with disabled modules (same thing, after some time, the "suttering" occurs), clear memory cache, re - install Java (which seemed to help a little). Any ideas what the hell is wrong? I don't want to create a new profile and move everything - I want my current profile over to work as it should. I'm really tired of who - I am also using Opera and Chrome (I am a developer web, so I need them), but I like FF the more, but with this problem occurring over and over again after a while, I really think to give up Firefox.

My problems were related to the addon of all in a sidebar. Which have been set by the last update.

Tags: Firefox

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