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

It's because of their massive bloat due to Rust, if nothing else. Their xul.dll in Windows is currently a whopping 172 MB in size (as opposed to our 38). I'm pretty sure most of that is due to Rust. Add to that a ton of gadgeteering support and "remote" control code and telemetry, and it adds up. Not to mention a bunch of "helper apps" like a messaging proxy that tightly integrates with Chrome if installed on the same system.