I found out. It's not an extension conflict but an application. Problem solved. Thank you so much. Maybe this is not a Firefox bug, sorry for misreporting.
-- firefox suspended whatever a download link clicked https://bugs.launchpad.net/bugs/627817 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
