Firefox 13 High CPU Utilisation

Hello I have installed the latest update and have realised that Firefox’s CPU has sky rocketed it sometimes dips to a normal level but the majority of the time it is around 8-13. With just firefox running it is around 20% utilisation. .
I have tried using safe mode and have used CCleaner to completely remove history, compact database etc. This unfortunately hasn’t improved the problem.
I would appreciate any advice on how to resolve the issue and wondered if anyone else has had similar issues.
Thanks
BTW this is on a Windows 7 x64 machine if that helps?

Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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