So yesterday I was opening a Tumblr post in Microsoft Edge, an when I tried to click on it, an ad window popped up. Is it actually normal? In fears of getting a virus, I made a 1-day system restore, and then ran Malware Bytes. Fortunately I got nothing, but I'll be running Avast to make sure that I haven't got anything nasty. Any ideas how this could be happening, and how to solve it? Edit: I meant to write "Tumblr blog" in the title. Can someone change this?