I think it should be clear how to use umatrix.

Turn everything OFF for all sites by default. I turn off third party stuff and all scripting.

Then visit a new site. Then opt-in until you either - decide the site sucks and leave, or get something acceptable and read your article. Then press SAVE to save the settings for that site.

It's worth mentioning that many sites do not render well without javascript, but reader mode renders a perfectly readable article.

but also it's much MORE prevalent that you turn on javascript and the site will do much worse things.