My browser can also disable js (per site as well) with out any plugins, but doing it globally breaks too much and whitelisting those sites (and 3rd party they rely on) is way too much effort. Worst case that happened to me is a payment that went through but some bit of JS never ran so the order didn't make it to the shop.

Looking forward to a blocker that can detect if a script is going to pop up and block that (and it'd be ok to have to whitelist the few sites whose entire funtionality is popup based, like twitter), but I think that's equivalent to solving the halting problem.

I was running uMatrix with first-party scripts disabled by default for a while, but I found a lot of pages I needed 3 or 4 refreshes to get content. It opened my eyes to how much simple static stuff in dependent on Javascript; stuff that really shouldn't be.