July 15, 2010
Google is testing a new feature that allows you to sign in to multiple Google accounts in the same browser. Sweet! I hate signing out of one account and switching to another. Or worse, leaving Firefox and having to use Internet Explorer to sign onto another account. I suppose I could use Chrome. Still, it's a pain to toggle between Google accounts. Multiple sign-in only works for Gmail, Google Calendar, Google Reader, Google Docs, Google Sites and Google Code, but it's likely that other Google services will be added when this feature will be publicly available.
According to
Google Operating System, "If you use a service that doesn't support multiple sign-in, it will default to the first account that you signed in using your browser. Google suggests to use a different browser, but you can also use
Chrome's incognito mode to sign in to an additional Google account."

You do lose Gmail's offline mode feature (disabled) if you turn on multiple sign-in.
Check out the screenshot of the feature:

Of course, there is a Firefox addon called
GmailManager that lets you sign onto multiple Google accounts at the same time.
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this is great