It is possible to open Multiple pages whenever you open Firefox after simple setting ,This tweak only works in Firefox and no other browser is supporting this pattern.Here’s How
Go to Tools > Options In the Main Tab, you will see the field Homepage. Enter the multiple webpage addresses separated by a pipeline “ | ” character, as shown in image below.

You can open any number of pages using above setting, it is not neceaasry that you put URL with or without http.
Tagged as: Firefox
