So Floorp is basically Waterfox without a track record and feature bloat?
or Vivaldi but open source and Firefox-based?
Just use userChrome.css and extensions if really needed and hope you don’t get hacked.
Floorp is based on Firefox ESR.
So basically an old version of Firefox with some security fixes backported each release, sort of like QtWebEngine.
Well you’re mostly correct. Vivaldi is built on Chromium. It definitely uses a lot of RAM but they’re parterned with Proton so I think that carries a tonne of weight in trusting them…
Vivaldi
Even Chrome would make more sense privacy-wise. Avoid at all costs.
There is zero reason to use these browsers like Mercury, Thorium, Floorp, Waterfox, Zen, Vivaldi, etc.
For Mercury, Thorium, and Waterfox I agree.
Only reason anyone would want to use Floorp and Zen is for customization but if that’s all just use userChrome.css (as long as you trust the maintainers of the custom CSS themes) on Firefox instead.
You don’t have to trust the maintainers if you write the CSS yourself 
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I appreciate your reply!
However, Proton has made a significant partnership with Vivaldi so I think this boosts Vivaldi’s security repertoire.
Mercury on the other hand, I just checked and it hasn’t been updated in over a year…: GitHub - Alex313031/Mercury: Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat.