Have several Gmail accounts? Facebook? Whatever? Tired of having to log out before you can log in as a different user? Wondering if man-made global warming is a hoax? Most of these can be solved with Multifox. Developer:
"Multifox is an extension that allows Firefox to connect to websites using different user names. Simultaneously! For example, if you have multiple Gmail accounts, you can open them all at the same time. Each Firefox window, managed by Multifox, accesses an account without interfering each other."
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