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Firefox hangs or freezes when I try to change pages. It has happened since I downloaded Firefox 4 update.

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I downloaded Firefox 4 recently. My computer has slowed down and is sporadically hanging or freezing. It is happening more frequently. It seems to be related to the update.

I downloaded Firefox 4 recently. My computer has slowed down and is sporadically hanging or freezing. It is happening more frequently. It seems to be related to the update.

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Do you have that problem when running in the Firefox SafeMode?
A troubleshooting mode.
You can open the Firefox 4.0 SafeMode by holding the Shft key when you use the Firefox desktop or Start menu shortcut. Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.
To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut to open it again.

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes