Most search engines support site exclusion (a minus character followed by the site domain). For example: [https://duckduckgo.com/?q=oled+tv+-amazon.com+-bestbuy.com+-walmart.com&t=h_&ia=web oled tv -amazon.com -bestbuy.com -walmart.com] ''Note: it doesn't hide the ads; that's a different issue.'' But it's a bit annoying to manage these exclusions in the URL so you could consider using an add-on. I'm aware of two add-ons to block unwanted sites in search results, and one other approach. I don't use either of these extensions myself: * https://addons.mozilla.org/firefox/addon/ublacklist/ * https://addons.mozilla.org/firefox/addon/hohser/ Along the same lines, I have an old solution that runs through a user script engine like Tampermonkey or Violentmonkey. If you already use one of those, maybe this would be efficient for you. More info here: https://www.jeffersonscher.com/gm/google-hit-hider/index.php