I am looking for a popup blocker to work with firefox 1.5 - the Yahoo toolbar used to work but I see it is only compatible with 1.0 & 1.+ (whatever 1+ is). I see that there is a download for popup killer 1.51 from DigiByte Studio & might try this freeware . I am a little concerned about the ease of uninstallation. An article in a Which? suggested that it might be worth investing in a dedicated uninstaller program "such as Norton's Clean Sweep" for people who download a lot of freeware & shareware. Is this really a good idea? I run XP, have CCleaner & Erunt.