Generally, I hit the option to "stop script" and then I reload the page.

I use ad block so if it's not an ad, what is it?

probably most often, you need scripts for any page where you're going to be making purchases or downloading files, so you often have to turn off script blocking for those pages. I don't know of a script blocker that works really well -- it seems they block too much, or not enough. But at least if you keep having trouble on the same page you can turn on the script blocker for just that page. Then, eventually, if you need to do something that requires JavaScript on that page, you can temporarily turn off the blocker and hope for the best.

It's increasingly common for Web pages to be basically nonfunctional w/JavaScript turned off, so I guess we'll all have to learn to debug scripts before long ...