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Firefox
Firefox browser is based upon the only non-chromium engine Gecko.
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You have 2 options to make the default config of firefox more privacy centric:
Use a strictly privacy focused variant of firefox
- Librewolf
- Mullvad Browser
Note that I won't be summarising every fork of firefox in their own page,the official sites do a great job of that
Modify the browser yourself based upon hardening guides:
Basic Firefox privacy guideMore serious hardening guide using arkenfox.js