We haven't really tested any other mainstream browsers, she has Chrome and Tor but it won't go away for her. I had it pop up last night and just kicked off my pc wifi and back on and it stopped but that trick is not working for my fiance...so probably that was just a coincidence. There is no online feedback, chrome is not saying anything but if your seeing this and we are, definitely an issues somewhere. Windows did update, wonder if that is it? You on windows 10? Well seeing we are both screwed with the same issue, followed you for feeling your pain. If I find a fix I will let you know, let me know if you sort it too if you can