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While the Mozilla Firefox does a decent job in blocking trackers without extensions, Brave Browser does a great job in that without the need for extensions.

I would still like to mention that the Firefox browser's user interface is significantly better than Brave.

I think it's important to avoid using extensions as much as possible!

Not necessarily. Even the founders of Mozilla Firefox recommend installing an adblocker for the Firefox browser.

What I think is really important is to avoid Big Tech as much as possible.

I think extensions for Google Chrome can sometimes access information in your browser that it shouldn't.

At least that is what I heard 👍

Google Chrome extensions can always access information in the browser whenever they want to (and send them anywhere they want), not to mention Google Chrome itself.