The root cause is removing the "-remote" option in Firefox 36: https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#Remote_Control https://bugzilla.mozilla.org/show_bug.cgi?id=1080319
I'm running XFCE and the option is used in /usr/share/xfce4/helpers/firefox.desktop. Workaround: replace the last line in /usr/share/xfce4/helpers/firefox.desktop with: X-XFCE-CommandsWithParameter=%B -new-tab "%s";%B "%s"; ** Bug watch added: Mozilla Bugzilla #1080319 https://bugzilla.mozilla.org/show_bug.cgi?id=1080319 ** Also affects: exo (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1425972 Title: Links from thunderbird email do not work To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/1425972/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs