If you still use FireFox 1.0.7, please note it is vulnerable to some of the problems as well. I’m expecting a 1.0.8 to be released but since it’s taking it’s time it might be easier to take the step to the 1.5 series.
If you’re seeing unwanted pop-ups or ads, browser extensions or toolbars in your web-browser, you might have an adware, malware or spyware installed on your computer. Here are some steps you can take to remove unwanted software. Or ask for help here.