Firefox hangs when it is opened and is unusable unless a new window is opened

Since installing Firefox 4 I have noticed this recurring problem, I open Firefox then 10 seconds later the program hangs allowing no interaction with the tabs in the window nor allowing access to anything beyond the first 'Firefox' drop down menu. I have to open a new window quickly in this small time frame in order to keep using the browser.
Is there some way to stop it hanging so I can use the window that opens when I first boot Firefox? I have had this problem on two different computers using two different operating systems (on old Windows Vista laptop and a new Macbook pro) so I know it is not a problem with my computer.
The strangest thing is that Firefox doesn't come up with an error message or anything, it just hangs without precedent. I have only had this problem since 'upgrading' to 4.

Do you mean this?
*http://kb.mozillazine.org/Error_loading_websites

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