Firefox freezes when loading some web pages then the computer locks up

Sometimes, when loading a website, the browser freezes. Then the computer locks up and I have to use the power button to turn it off. There seems to be no pattern to this problem. I'm also not sure whether or not the problem begins within Firefox, but a web page was loading every time it happened. It has only started happening this week.

I seem to be having a very similar, if not exactly the same issue. I'm using the latest production FF 11.0 release on Win7 64 and as with this not only does FF freeze, but I can't task switch, or anything. The one thing I've noticed is that when the lockup happens, it always appears to be loading some custom font from a CDN, if I breathe deeply and slowly and allow the request to complete everything seems to eventually unfreeze and I can continue, so maybe something to do with implementation of custom font loading?

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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.com/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.
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
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*http://kb.mozillazine.org/Error_loading_websites

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Reload web page(s) and bypass the cache.
* Press and hold Shift and left-click the Reload button.
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Post Moved Took-36-seconds-to-load-some-web-pag...

Moved to Infinity board http://community.bt.com/t5/BT-Infinity/Took-36-seconds-to-load-some-web-pages/td-p/858878
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Firefox will not load any web pages

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Hi JessN37,
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Firefox freezes when loading some web pages then the computer locks up

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