Generally, if the website breaks it's "scripts" from somewhere, or rarely xhr. When it's frames, it looks like a chunk of the site is missing. If media won't load it is media. And basically never allow anything from a dark red square.

I'd check umatrix's site and there are a number of presets to make major sites work you can use. After that, if a site doesn't work fiddle with allowing things from places. Save when you're content. It's pretty easy to get the hang of.