Hi This does not sound like an issue with Firefox but I can try to point you in the right direction. The easiest way is to run a full virus scan and follow the guidance from your anti malware provider to remove it - may be as easy as clicking one button. A more complex manual method is detailed in this external blog entry: https://malwaretips.com/blogs/remove-winbigdrip-life/ Please read up on the topic beforehand very carefully before following any guidance.