How many threads about that "little blue malware blocker etc." do you need? https://support.mozilla.org/en-US/questions/1123885 "I had a tiny blue antivirus thing, paid for it, which was also called something like that, it has disappeared after reinstalling; can't find it anywhere in the add-ons either. " You expect a lot by not even knowing the name of what you had. How is one of use supposed to search for "little blue malware blocker" or "tiny blue antivirus thing" to try to help you You may not realize it, but there are many thousands of add-ons which are available for Firefox? ''It may be even 10's of thousands.'' First step is to do a search here: https://addons.mozilla.org/en-US/firefox/