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It sounds as if you want to implement some kind of content filtering, perhaps for a child?Can you recommend any addon for Chrome or Firefox to block certain sites from appearing in the Google search?

It sounds as if you want to implement some kind of content filtering, perhaps for a child?
Sorry should have added that in the OP. I'm currently doing an extensive research for a major essay that I have to write for university, where I have to filter through a lot of news sources. In my field of research there are some sites that always use catchy headlines that promise useful and informational content, but the articles themselves turn out to be mostly superficial or sensationalist. Therefore there are a few sites that I would like to block from appearing in the search results, at least as long as I'm doing this research.The minus sign works in Startpage and Duck. It even works on Play Stores search.
I got tired of all the skins for the Go launcher appearing. They aren't real apps and should not appear if only searching for launchers. I finally used the -sign and got rid of them.
This is more general usage than that search operator site:I've also found a good article on the most common search operators for Google: https://www.1and1.com/digitalguide/...earch-more-effectively-with-google-operators/