Set More than One Website as your Firefox Home Page

This is the way to have one-click access to all of your favorite websites. For example, you can set the Firefox home button to open your email, favorite news site, and Facebook all at once.

1. Open a new window and load the first web site you want in your home page.
2. Click the new tab button and open the next web site you want in your home page. Repeat this step until you’ve opened all desired sites in new tabs.
3. At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options.
4. Select the General panel.
5. Click Use Current Pages. [source]