You can get that behavior if you install Firefox from a tar [1], Firefox will then manage its own updates the same as on Windows (though the user running Firefo

You can get that behavior if you install Firefox from a tar [1], Firefox will then manage its own updates the same as on Windows (though the user running Firefox will need to have permissions to modify the files, which may be risky). But if you install it through apt or some such package manager, the PM is doing the updates, and it doesn't take into account that Firefox is running. [1] http://archive.mozilla.org/pub/firefox/releases/latest/README.txt http://archive.mozilla.org/pub/firefox/releases/latest/READM... has instructions for getting a release tar.