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Zen Browser: A New Privacy-Focused Browser(Firefox)
(techwavearena.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Is there any reason to use this over Librewolf?
The UI/UX. Nothing else, to be fair. They have some nice features (like 'glance'), too
no, if you don't care about vertical tab bar. also you can apply the betterfox scripts into your librewolf user.js.
Practically speaking, probably not.