HelixPlayer owns the /usr/lib/mozilla/plugins directory, which may cause problems with other plugin packages that use "Requires: /usr/lib/mozilla/plugins" to depend on a mozilla plugin compatible browser installed. See bug 131247 and bug 131667. There was also a bug report against firefox about this, can't find it now, but it has been fixed anyway. Suggested fix attached; includes also an off-topic fix for .desktop file permissions.
Created attachment 109359 [details] Require, don't own mozilla plugin dir, fix .desktop file perms