firefox-for-twitter
Hello friends we all know that how to open multiple account on google chrome. but if you want to open multiple facebook account on fire then follow my steps :

But this trick is working on latest firefox (nighty 20. ).
  • Open firefox browser.
  • now click on menu and then click on ‘New Private window’ .
  • now a new window will open with purple menu color.
  • now open ‘www.facebook.com’ and open your another facebook account.
  • so now you can access your both accounts at a time.
By this trick you can also open multiple google+,orkut, yahoo, gmail and other sites.
Please comment below if you like this trick.