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It looks to me as if both the JS78 part and firefox itself contain security fixes in this version.
When I was looking at thunderbird in Arch's AUR I noticed that ./mach build was preceded by ./mach configure. Doing that separates the configuration (everything up to 'reticulating splines' which is where the generated (Python) 'config.status' reads all the moz.build files and invokes the build back-end generator). It seems to me that since these stages can be separated, that is a more educational way to go.