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Firefox Tip: Run Multiple Instances of Gmail With Gmail Manager
Well, I have taking about too many ways to run multiple Gmail account simultaneously (method 1, method 2 and method 3) and still if you aren’t able to find the one for you then here is another try from my side.
Gmail Manager is that FireFox extension which will allow you to manage multiple Gmail accounts simultaneously. It displays your account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.
All in all exactly what you were looking for.
Download and Install Gmail Manager