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

Pale Moon forum - Forum index [Unofficial] June 15, 2026
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I think Firefox's macOS version is a "fat binary", which allows it to support both Intel and ARM in the same package. We have separate DMGs for each architecture.

Yes, that seems to be it.

CODE:

> file /Applications/Pale\ Moon.app/Contents/MacOS/palemoon

CODE:

/Applications/Pale Moon.app/Contents/MacOS/palemoon: Mach-O 64-bit executable x86_64

CODE:

> file /Applications/Tor\ Browser.app/Contents/MacOS/firefox

CODE:

/Applications/Tor Browser.app/Contents/MacOS/firefox: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64- Mach-O 64-bit executable x86_64] [arm64:Mach-O 64-bit executable arm64- Mach-O 64-bit executable arm64]/Applications/Tor Browser.app/Contents/MacOS/firefox (for architecture x86_64):Mach-O 64-bit executable x86_64/Applications/Tor Browser.app/Contents/MacOS/firefox (for architecture arm64):Mach-O 64-bit executable arm64

Assuming that the individual binaries of Firefox, for the two platforms, are roughly half the size (i.e. around 250 GB) that is still commendable for PaleMoon ...


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