Firefox

Hi all, sorry if this is a noob question but I use Firefox on Android and I want to know if there is a way to block certain websites from showing up in search results when searching for something.

For example, if I search for something, I don't want the search engine to show a few reddit threads or some random news site with clickbait articles or in general which don't make any sense? I would like to completely block such sites from showing up in my search results and in a way tidy up my search.