How long do you wait before rebooting? On some systems, a TCP/IP request that's "dropped" by the network connection can cause an apparent "freeze" 'till the adaptor times out, and some adapters default to a 600 second time out delay.
So, on the face of it, I'd suspect "network problems" rather that "Firefox problems."
Have you tried any other browsers? (e.g., Konqueror, Mozilla, etc.)
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