As others have stated, does not work with Startpage. Not able to block out the massive Reddit, Amazon and MS links, to name a few, is quite the bummer!

This isn't working for all supported search engines in Firefox. While it's working with DuckDuckGo, it's not with Startpage. Adding a domain to the list to be hidden does not affect the search result list. There's an old open PR and the last activity in the codebase was quite some time ago. This leads me to think the extension has been abandoned

It does not work for video search results. Can you make an addon that will work for video search results?

Didn't hide or transparent, but did highlight the 1st one, with part of the url specified.
rule for *.com did nothing
2nd try at highlighting didn't highlight.
Am I missing something?

I moved away from "Seartch Filter" which sadly doesn't work to that. First test of "block or highlight" : I hide the domain "https://stability.ai/". I run a search to see what happens : it hid the domain, cool, but also tons of other pages such as this one: "https://www.instagram.com/stability.ai/" ... Why ??? Because... it has the words "Stability AI" in it ?

This add-on proposes to hide a DOMAIN NAME but instead it hides tons of (totally) unrelated domains.

Absolutely useless as it is.
Two stars because the different options for hidding / highlighting are definitely a great idea. Too bad it doesn't understand... what is a domain name 눈_눈