Description of problem: mozilla extensions are installed into /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384} that is owned by 'firefox'. mozilla-filesystem owns /usr/share/mozilla/extensions directory; could it co-own {ec8030f7-c20a-464f-9b0e-13a3a9e97384} too? Additional info: This issue comes up from bz#1128754: https://bugzilla.redhat.com/show_bug.cgi?id=1128754#c7
No really. That dir is owned by Firefox only. There may be other subdirectories owned by Thunderbird and Seamonkey and mozilla-filesystem is required by all mozilla packages.