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Firefox hangs every few seconds with increased cpu usage

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For the past month or so, firefox has randomly started hanging for a second or two at a time, while also having sporadic CPU usage, from 3-15 on an i7 while not changing pages or with any videos playing in the background. It will also freeze while typing making it difucult to type. Last time this happend I tried creating a new profile which didnt help, only moving the old profile and reinstalling firefox fixed it for a month.

I've check for the sessionstore.jar but it's not there, i've tried safemode however it did not help the issue. The only Add-on's I have are Addblock and Greese monkey with youtube center.

Turning off gresse monkey does not help and neither did reinstalling flash

Any ideas besides reinstalling?

For the past month or so, firefox has randomly started hanging for a second or two at a time, while also having sporadic CPU usage, from 3-15 on an i7 while not changing pages or with any videos playing in the background. It will also freeze while typing making it difucult to type. Last time this happend I tried creating a new profile which didnt help, only moving the old profile and reinstalling firefox fixed it for a month. I've check for the sessionstore.jar but it's not there, i've tried safemode however it did not help the issue. The only Add-on's I have are Addblock and Greese monkey with youtube center. Turning off gresse monkey does not help and neither did reinstalling flash Any ideas besides reinstalling?

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I think the issue was linked to a chatbox inbeded into one of the forums I use. When it's not on the page with the chatbox it does not freeze, when i'm on it, it freezes. t most likely has something to do with the update time on the chat box