Log in 2 users in mozilla firefox
here I will let you know how Open Mozilla Firefox 2 together so that we can access the facebook user 2, user 2 Mozila even more.
Run first opened by pressing Win + R then type the code below into the Run box
firefox.exe-p-no-remote
See the picture below
then a new box will appear as below
After that click on Create Profile, and a new box will appear, click Next and it will be display as below
In column fill up your name, and then click finish :)
it will display the new profile with the name that you entered earlier, because my name is different from the content profile names also appear different profile.
if so, click the name of the profile that you created and click Start Firefox will display a new window firefox, you can use it to open facebook with a different account :)
Good Luck