What’s the best ad blocker for you? - Firefox Add-ons Blog

There are also (somewhat hidden) "hard modes" where the only indicator that you're in a different mode is that the badge number next to the uBlock icon changes color.

You can have it block all third party scripts by default for every website, or even go all out and basically use it like noscript. Pretty much breaks every individual website though but you can choose individually what to let through and save it based on domain (I believe) so you really only need to do it once.

There is also a setting under Default Behavior to disable javascript: https://github.com/gorhill/uBlock/wiki/Per-site-switches#no-scripting

Which would then require you to allow it for each site.

I use NoScript for that purpose though. I've not delved into uBlocks configuration, but NoScript makes it pretty easy to only allow javascript from certain sources on the page (can easily select which third party sites to allow).

Yes. For some websites I sit down and eliminate bunch of stuff to make it distraction free (and ad free) as possible. Right click and choose Block element... from the menu. Now you can click on Pick to select something from the page. Preview will show you if this is what you want and Create will add the rule to the settings. Or ESC to not add anything.

For some random sites where you want to remove temporarily stuff without creating rules forever, just use the Zapper. This is found in the Extensions menu when you click the Extensions icon. It's the left bottom button in this menu.