Bah, I'm still using Firefox portable version 2.0.0.14, along with Opera portable version 9.64. :P
I never bother to install that crap anymore, I just put the newer portable versions in their own directories to try them out.
Also the portable version of Firefox 5.0 is already up if you want to test it: http://portableapps.com/apps/internet/firefox_portable
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