I have an extension and it works on Chrome just fine. However, when I add the “browser_specific_settings” in manifest.json and try to make it work on Firefox, it doesn’t do anything. The code is available here: https://github.com/bluelockorg/Blue-Privacy-Extension. My extension is supposed to redirect Google searches to a private alternative, like DuckDuckGo and Startpage.
Also, there is an extension which does similar things as mine and this one works just fine on both Chrome and Firefox. The code is on: https://github.com/SimonBrazell/privacy-redirect. This extension redirects non private services, like YouTube and Twitter, to a private alternative.