This bug is also related with this bug of oxygen-gtk3: - https://bugs.kde.org/show_bug.cgi?id=331020
I attached a backported patch for oxygen-gtk3 1.0.2 that fix Firefox start. ** Bug watch added: KDE Bug Tracking System #331020 https://bugs.kde.org/show_bug.cgi?id=331020 ** Patch added: "Patch: Only register menubar to animation engine if the widget is actually valid." https://bugs.launchpad.net/ubuntu/+source/oxygen-gtk3/+bug/1575781/+attachment/4650175/+files/oxygenthemingengine.cpp.patch -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to oxygen-gtk3 in Ubuntu. https://bugs.launchpad.net/bugs/1575781 Title: Firefox 46 crashes on Ubuntu 12.04 (precise) with Oxygen-GTK3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1575781/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs