Every time I open up Firefox it takes about 5 minutes to start, what may cause this?

I am using Vista

''What might be the cause of Firefox taking 5 minutes to start up?''<br>
*Lots of big extensions
*One really bad extension
*One big home page
*Lots of tabs loading up from last session instead of one home page
You might take some time to check your extensions to those listed in
*"[http://kb.mozillazine.org/Problematic_extensions Problematic extensions]" -- if it doesn't load try [http://webcache.googleusercontent.com/search?q=cache:http%3A//kb.mozillazine.org/Problematic_extensions Google's cached copy]

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