Is there anyway to have firefox open multiple tabs on start up. Not the tabs from last session but say for example gmail, google voice, and superuser. Is this possible?
Under Tools > Options
go to the "Main" tab.
Under the Home Page text box where you key in your home page, just separate addresses with the pipe symbol (the one above your ENTER key usually).
e.g www.google.com | www.huffingtonpost.com | superusers.com
will open up 3 tabs whenever you start Firefox.
alternatively, open all the pages you wish to load automatically when Firefox starts then go to Tools > Options > Main > Startup, make sure to select When Firefox starts Show my home page and hit the button Use Current Pages.