There's a very annoying Amazon Popup Ad going around on Android and iPhone phones. If you Google it you'll find hundreds of post on the issue. It's made by a company called Cloudfront, and it's scripted to bypass browser popup settings, so it's basically malware. Sometimes it can be hard to get rid of and it will lock some browsers up. It seems to hide in your browser cache, so simply clearing your browser data isn't enough and it will keep popping up no matter what site you visit. There are variety of methods to get rid of this malware, such as, clearing both your browser data and cache, turning off java script in your browser, installing Malwarebytes from your app store.