I’ll have to admit that most of the times, I need to have multiple logins on a single browser. Be it checking messages or viewing/exchanging details from multiple accounts, you’ve got to admit at one point or another, there was a time that you wanted to login to multiple accounts at the same time on the same browser. If you’re using Firefox, there’s an extension that gives you this convenience called Multifox.
Once installed, you can enable the multiple login feature is by selecting the “Open in a New Identity Profile” option from the right click menu. This will open a new browser window (not a tab) and from there you can login to the very same site (say… gmail) without logging out of your other account. Useful isn’t it?
You can download mutlifox form the official mozilla repository which is right here.