If this were a GNOME-specific change, and it were made downstream by Ubuntu, I assume it could be put in the firefox-gnome-support package. That seems to be installed by default in Ubuntu, but I assume not Kubuntu. If it were upstream, I don't know.
If this were a GNOME-specific change, and it were made downstream by Ubuntu, I assume it could be put in the firefox- gnome-support package. That seems to be installed by default in Ubuntu, but I assume not Kubuntu. If it were upstream, I don't know.