RT Redréovič

This is true. I am unsure why this comment is getting downvoted more.

Part of Mozilla’s funding comes from Google. I adore their browser and other software however the corporate itself has a questionable history as it is with many corporates usually anyway.

Greetings. uBlock Origin is a great choice. However I must add that you should instead opt for a custom user.js and drop Privacy Badger and Decentraleyes as they are mostly redundant. Refer this.

As for Startpage and DuckDuckGo, I suggest avoiding them. These are not open source search engines and have a suspicious and questionable history regarding their ethical position. I suggest SearXNG. It is an open source Meta Search Engine, i.e., it congregates results related to your search from multiple search engines without giving them your IP. As it is open source, it is self hostable (you may request your instance admin to host one if you wish to) and multiple instances exist. Make your selection here.

Firefox is a great browser to switch to, it has a vast variety of customizability in configuration. It is a very flexible browser and it has helped me a lot in the past few years.

As a further suggestion on top of it, do use a custom user.js to harden your browser even more, set up your DNS Resolver to use Quad9 or any other private DNS Server like Scaleway, NextDNS, etc.

I also recommend using Oblivious DNS over HTTPS for added security.

I am on a Freedesktop Linux system hence I refered to the Archlinux Wiki in setting the beforementioned configurations up.