God no, it’d be another Chromium fork because making a browser is too damn expensive. There are more than enough Firefox forks in existence. LibreWolf is more than enough for a starting point.
Vivaldi is arguably the closest you'll get to a Proton Browser at the moment. A focus on privacy, EU based, and it even includes the free tier of Proton VPN built in.
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https://vivaldi.com
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