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Multiple facebook account login  in firefox -

1.By Manual Tweaking : 

STEP 1: Right click on the shortcut of Firefox web browser and click on Properties.

STEP 2: Now, at the end of Firefox Target, you need to add the below code at the end of the path,

-profilemanager –no-remote

For example, C:\Program Files\Mozilla Firefox\firefox.exe” -profilemanager -no-remote

STEP 3: Now when you open the Firefox, you would find a new box. And there you could to login multiple Facebook Accounts.

By Add on :

Multi-Fox Addon is a Firefox add-on which lets you log into more than one Facebook accounts. You can try it , if you not prefer tweaking its settings. Download it from HERE

Login Multiple Facebook Accounts On Chrome:

If you are using Facebook on Chrome, the only way to login multiple Facebook accounts, then you can do it by operating in Incognito mode.

So just by hitting Ctrl + Shift + N, you can launch Incognito browser where you can login to another Facebook account. Or Go to wrench menu and then open a new Incognito Window.