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Linux also does not allow you to overwrite a running program; you'll get ETXTBSY.

The difference to Windows is that Linux allows you to delete (unlink) files that are in use. The inode actually owning the data continues to exist until the program is dead.

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Yes the file still exists physically in disk, but if you were to execute the binary path again, would that give you the old or new result? I'm not sure how Firefox process isolation works, but it could be (armchair guess) that they just spawn the binary with inputs, which would be a possible cause of incompability.

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