Late replying, but who exactly do you think is going to lead this? Firefox is so bloated at this point precisely because there's a mandate to make it fast and support new web features. There are so many Rust dependencies that I can't even build Firefox on a computer with "only" 16 GB of RAM because it runs out of memory while compiling gkrust and freezes the computer or hangs the build.
Starting from scratch doesn't have a chance at this point. The web is too complex for a volunteer team to build a brand new browser. So the only option is a fork of Firefox, but most of the people who have the time, energy, and ability to work on fully understanding the Firefox code base probably work for Mozilla.
Starting from scratch doesn't have a chance at this point. The web is too complex for a volunteer team to build a brand new browser. So the only option is a fork of Firefox, but most of the people who have the time, energy, and ability to work on fully understanding the Firefox code base probably work for Mozilla.