A common complaint has been heard on the internet about this issue.
What the heck in js.worthathousandwords.com, every time I try to read an email this comes up and I can’t read I only see a blank page and nothing else will happen the js.worthathousandwords.com is at the bottom left hand corner of my screen. Help!
Some of the experts have this answer.
A short term solution is to quickly press escape on the keyboard to stop the js, this would apparently stop the page to load while you are on Yahoo mail.