Firefox keep eating my CPU

FF 3 had this problem FF4 has it too... I hardly use add ons, have disabled Flash but every once in a while for no apparent reason CPU goes to 90, heck even 100%... the only way out is to stop FF, use ALT CTR DEL to stop the program and start a complete new session. This is a problem regardless how many tabs are open, regardless whatever website is open. It happens with one TAB, with many TABS, and worst... it can never be solved by just waiting until FF has finished with whatever it does. WHY WHY WHY...

# Does it happen in [[Safe mode]]?
# If yes, see [[Troubleshooting extensions and themes]]
# If not 2., it may be caused by HW acceleration. You can have graphic info in about:support, graphic section at the end to see if HW acceleration is enabled and if your graphic driver is old.
# Try to update your graphic driver from your computer manufacturer support site.
# If not fixed by 4., disable HW acceleration in Options > Advanced > General.

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    #Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
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    [[Image:aboutcrashesFx29|width=520]]
    <br><br>
    Thank you for your help!
    More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.

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    Create a new profile as a test to check if your current profile is causing the problems.
    See "Creating a profile":
    *https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
    *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
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    *http://kb.mozillazine.org/Profile_backup
    *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
    *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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