Pale Moon for Mac OS • Re: How is PaleMoon 5 times smaller than Firefox on macOS?

Not to mention a bunch of "helper apps" like a messaging proxy that tightly integrates with Chrome if installed on the same system.

Why would Firefox need "helper apps" to integrate with Google Chrome? Perhaps it is for "syncing browsing data" between the two - if I remember right, both can can import bookmarks and maybe even history from each other? But it is weird if, as you say, Google Chrome can send messages to Firefox and ... do something ... !!? (Or did you mean the "Firefox's chrome"?)