1. On the top of Firefox, click Tools -> Options -> Main.
2. Under 'Homepage' put something like this: www.google.com | www.yahoo.com | www.trueborngaming.com.

There has to be a space in between the site and the line |. If you do not have this key on your keyboard, simple press SHIFT + \.

how does that look?
does it open each in a new tab?

Nice. Thanks for the tip.
Just tried it and works great.

They might as well let you write scripts and have firefox do the browsing for you.. sheesh

for (int i=0; i<homepage.size(); i++)
{
url.open(homepage[i]);
}

lol...

I tend to have about 15 tabs in Firefox open at one time. Most of them are sites I visit on a daily basis, so I did a Google search and found this was a way of doing it. I don't know if it's the easiest, but it certainly works :).