I was so close to accept LibreWolf and finally make the switch from Firefox. But sadly LibreWolf does not support saving in Browser passwords. Its because of security concerns, I get it. But look, I want to save passwords in the browser. And sadly this killed LibreWolf for me.

Did you mean 1MB? With correct settings, you get under 1MB Rust binaries and with even more compression using upx it gets to 300KB, probably less for much simpler applications. Rust applications aren’t that big of a deal as people make it to be; within reasons off course.