This will be disabled by default in Firefox 57, currently scheduled for release on 14th November 2017. See http://www.phoronix.com/scan.php?page=news_item&px=Firefox-Middle-Click- Bug for more details.
** Changed in: firefox (Ubuntu) Status: New => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/731113 Title: 2 tabs with single middle button click To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/731113/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs