Could you elaborate on modularity? Also Chromium is there, it's open enough to be a base for Chrome, Brave, Edge, and probably a few more, and it's open source

Could you elaborate on modularity? Also Chromium is there, it's open enough to be a base for Chrome, Brave, Edge, and probably a few more, and it's open source, forkable at any moment Google adds something unpatchably bad. (of course independent implementations are welcome, but the ultimate goal is a healthier web through user freedom, and that doesn't necessitate Firefox directly, a ChromiumFox would be just as perfect)