Hey! this is cool (was scary at first). If you have many websites you visit a lot, you can set them all (tabbed) to your Firefox homepage. I wanted to change my homepage to the new cool google personalized page (www.google.com/ig), the other day and I had a few other windows open.
I didn't notice when I went into “Tools”,”Options”, “General” that the button said “Use Current Pages” Next time I opened FFox, I couldn't figure out why there were multiple tabs opening. Nice way to start the day! Open all your usual suspects with one click! I love Firefox!