Recently I have started experiencing a pop up which I believe is adware or something malicious trying to disguise itself as something legitimate from Firefox. This started about the time I installed the Firefox version 50.1.0 update on December 15th. This happens about every 3 days and only when I go to Yahoo.com. It occurs when I'm browsing their news headlines and I don't actually click on any links in yahoo. A pop up appears on my screen that says: you have chosen to open firefox-js which is: java script file (9.2 kb) https://gaibacoupontec.com Also every time this happens the https:// changes to a different address each time. I have screen shots of several of these occurrences. I attempted to upload one screenshot with this question, but for some reason it would not attach the file. I didn't know if this is a firefox problem or not, but tries to appear as if coming from firefox so I thought I would ask the question here and see if anyone else has had this problem and maybe someone could tell me what I need to do to fix this. Any help would be appreciated.