What to do next?? Is it malware or not?

boston blacky wrote:
Two (2) days ago I was doing nothing unusual just routine stuff on the internet when this happened! A pop-up from nowhere prevents me from deleting it and going forward or back. It says something about calling their 1-800 number - and learn more about this issue / from S3.AMAZONAWS.COM, etc. etc.

It was likely Javascript malware embedded in either the webpage or affiliate ads. I've even had these popups on Yahoo News Sponsored links - no surprise following the revelation of 400 million Yahoo mail user accounts breached back in 2014. At least they notify account holders in a timely manner? :S

Browser popup blockers will not likely work with Javascript based popups. You'll need to kill the browser page if it locks it. Try the keyboard command ALT+F4. If that doesn't work, press CTL+SHFT+ESC and end the browser process.

Amazon web services (AWS) permit the use of HTML including scripting. Dropbox uses AWS, and is dropping HTML support in October. Likely due to abuse, similar to what you experienced.