This is a big problem when you want to open a Facebook account without logging out from your previous account. So today i have a solution of this problem with different browsers. First thing is that there is no software required to open multiple Facebook accounts at the same time on same browser. Below i have different methods for different browsers that will explain how to open multiple Facebook accounts at the same time on same browser.
1: Chrome
Open your chrome browser and press "CTRL+ALT+N" a New Incognito Window will open and now you can open your second Facebook account without logging out of previous Facebook account.
2: Opera
Open your Opera browser and press "CTRL+ALT+N" a New Incognito Window will open and now you can open your second Facebook account without logging out of previous account.
3: Mozilla
Open your Mozilla browser and press "CTRL+ALT+P" a New Incognito Window will open and now you can open your second Facebook account without logging out of previous.
4: Safari
Open your Safari browser and press "CTRL+ALT+N" a New Incognito Window will open and now you can open your second Facebook account without signing out of previous Facebbok account.