[3np]

Not a browser add-on but changing to self-hosted searxNG. Proxy searches to your engines of choice, filter and rewrite urls to your liking (like yt->piped, medium->scripe.rip).

[achairapart]

You can actually pair this with a browser extension: Privacy Redirect[0].

You can setup your own self-hosted instances or existing third party ones. It's a game changer both for privacy and UX.

[0]: https://github.com/SimonBrazell/privacy-redirect