Bug#885920: [firefox] Firefox window doesn't show under wayland

[rastersoft]

Package: firefox
Version: 57.0.3-1
Severity: grave

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When launching Firefox under Gnome shell/Wayland, nothing seems to 
happen: no window is shown. But doing a "ps ax" shows two processes with 
the name "firefox". Killing the second one (the one with the bigger PID) 
makes the window appear and everything seems to work fine.

Using Gnome shell/X11 everything works fine.

Tried it removing all Gnome shell extensions, and also all Firefox 
extensions. Same result.

--- System information. ---
Architecture:
Kernel: Linux 4.14.0-2-amd64

Debian Release: buster/sid
500 unstable repo.skype.com
500 unstable ftp.debian.org
500 unstable dl.winehq.org
500 stable repo.skype.com
500 stable dl.google.com
500 any packagecloud.io

--- Package information. ---
Depends (Version) | Installed
==============================================-+-==================
libatk1.0-0 (>= 1.12.4) |
libc6 (>= 2.18) |
libcairo-gobject2 (>= 1.10.0) |
libcairo2 (>= 1.10.0) |
libdbus-1-3 (>= 1.9.14) |
libdbus-glib-1-2 (>= 0.78) |
libevent-2.1-6 (>= 2.1.8-stable) |
libffi6 (>= 3.0.4) |
libfontconfig1 (>= 2.12) |
libfreetype6 (>= 2.2.1) |
libgcc1 (>= 1:4.2) |
libgdk-pixbuf2.0-0 (>= 2.22.0) |
libglib2.0-0 (>= 2.31.8) |
libgtk-3-0 (>= 3.0.0) |
libgtk2.0-0 (>= 2.10) |
libhunspell-1.6-0 |
libjsoncpp1 (>= 1.7.4) |
libnspr4 (>= 2:4.10.9) |
libnss3 (>= 2:3.33) |
libpango-1.0-0 (>= 1.14.0) |
libsqlite3-0 (>= 3.14.0) |
libstartup-notification0 (>= 0.8) |
libstdc++6 (>= 6) |
libvpx4 (>= 1.6.0) |
libx11-6 |
libx11-xcb1 |
libxcb-shm0 |
libxcb1 |
libxcomposite1 (>= 1:0.3-1) |
libxdamage1 (>= 1:1.1) |
libxext6 |
libxfixes3 |
libxrender1 |
libxt6 |
zlib1g (>= 1:1.2.3.4) |
fontconfig |
procps |
debianutils (>= 1.16) |


Package's Recommends field is empty.

Suggests (Version) | Installed
===============================-+-===========
fonts-stix |
OR otf-stix |
fonts-lmodern |
mozplugger |
libgssapi-krb5-2 |
OR libkrb53 |
libcanberra0 |



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