/etc/firefox/pref/apturl.js is in apturl-common 0.5.1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | pref("network.protocol-handler.app.apt","/usr/bin/apturl");
pref("network.protocol-handler.warn-external.apt",false);
pref("network.protocol-handler.app.apt+http","/usr/bin/apturl");
pref("network.protocol-handler.warn-external.apt+http",false);
pref("network.protocol-handler.external.apt",true);
pref("network.protocol-handler.external.apt+http",true);
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