How to login to multiple accounts at the same time

Do you have more than one accounts of the same website? Google, Facebook, Yahoo or Twitter perhaps? If you do then you must’ve realized that you can’t log in to your second account without logging off from the first one. In other words you can only access one account at any one time. Frustrating isn’t it?
But hey if you are a Mozilla Firefox browser user there is good news: An add-on called Multifox allows Firefox to access websites using different accounts, simultaneously! Each account will be opened in a new Firefox window, and they won’t interfere with each other.
Multifox works by adding a Profile command (Open Link in New Identity Profile) to context menus of links and bookmarks. It also adds a command to File menu (New Identity Profile).

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