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2 Like
CookieSwap
If you have multiple logins for web based e-mail accounts (like Gmail and Yahoo! mail), then CookieSwap enables you to easily switch between those different accounts by swapping the 'cookies' that the sites use to know you.
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2 Like
AllAccounts
AllAccounts is an extension that allows Firefox to connect to websites using different user names. Formerly known as Multifox 2 (BETA). It allows having individual cookies sets, chosen per tab.