Recently (probably 11 or 12 Aug 2017) I updated Firefox via package manager to version=55.0.1. (I try to stay, and am currently, up-to-date WRT LMDE.) Ever since then, I've been unable to stop/exit Firefox with either C-q (preferred) or mainmenu>File>Quit. This seems very odd: I've been using Firefox since it was Netscape, and have never had this problem on Linux. (Support for C-q on Windows was always unreliable.)
The only current way I've found to stop Firefox is uttering (in console) `killall firefox`, which of course crashes the running session, which complicates next startup. FWIW I consider this a kludge, not even a workaround, definitely not a fix.
Anyone else having this problem? Alternatively, any suggestions regarding how to debug/fix? FWIW, I'm running
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$ uname -rsv Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26) $ lsb_release -ds LMDE 2 Betsy $ cat /etc/debian_version 8.9 $ gcc --version | head -n 1 gcc (Debian 4.9.2-10) 4.9.2 $ /home/me/bin/get_NVIDIA_version.sh nvidia-settings: version 340.102 $ X -version 2>&1 | grep -ve '^$\|^[[:space:]]\|Current Operating System:' X.Org X Server 1.16.4 Release Date: 2014-12-20 X Protocol Version 11, Revision 0 Build Operating System: Linux 4.9.0-3-amd64 x86_64 Debian Kernel command line: BOOT_IMAGE=/vmlinuz-3.16.0-4-amd64 root=/dev/mapper/LVM2_crypt-root ro nomodeset nouveau.modeset=0 Build Date: 17 July 2017 01:40:19PM xorg-server 2:1.16.4-1+deb8u1+b1 (http://www.debian.org/support) Current version of pixman: 0.32.6 $ x-window-manager --version | head -1 metacity 3.14.3 $ /home/me/bin/get_GNOME_version.sh GNOME version=3.14.1 date=2014-10-19 $ /home/me/bin/get_wm_version.sh Cinnamon 3.4.6