How to Use Multiple Facebook Accounts in FirefoxIn Feburary 2016 26,

In Feburary 2016 26,
Navigate Firefox to Facebook's website. If you're already logged in to a Facebook account, log out by clicking 'Account' then 'Log Out.'
Enter the email and password for one of your Facebook accounts in the relevant boxes and click 'Log In.' Your Facebook wall appears, but Firefox also displays a pop-up bar at the top of the screen asking if you want it to remember this password -- click 'Remember.' If the bar doesn't appear, open the 'Edit' menu, click 'Preferences,' select the 'Security' panel and make sure 'Remember passwords for sites' is checked. Also click 'Exceptions' and make sure that Facebook isn't on the list of sites to ignore; if it is, click 'Remove' and retry this step.
Repeat Steps 1 and 2 for your other Facebook accounts.
Access a particular Facebook account by clicking in the 'Email' field on Facebook's login screen. A drop-down list of all your accounts appears below the field; click one of them to fill the fields in with the corresponding email and password, then click 'Log In.'
In Feburary 2016 26,