[Bug 1855997] [NEW] firefox www.google.com crashes when a firefox instance is already running and MOZ_ENABLE_WAYLAND is set to 1

[Marius Gedminas]

Public bug reported:

Steps to reproduce:

- make sure Firefox is not running
- export MOZ_ENABLE_WAYLAND=1
- firefox

then in a new terminal

- export MOZ_ENABLE_WAYLAND=1
- firefox www.google.com

Expectation:

- a new tab opens in the Firefox window, loading google

Actual result:

- firefox crashes

This is a recent regression: it used to work fine in
70.0.1+build1-0ubuntu0.19.10.1, broke when I upgraded to
71.0+build5-0ubuntu0.19.10.1.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: firefox 71.0+build5-0ubuntu0.19.10.1
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BuildID: 20191205203726
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 11 09:26:41 2019
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:722
DefaultProfileThemes: extensions.sqlite corrupt or missing
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-06-12 (181 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=71.0/20191205203726 (In use)
SourcePackage: firefox
UpgradeStatus: Upgraded to eoan on 2019-10-18 (53 days ago)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan wayland-session

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Title:
  firefox www.google.com crashes when a firefox instance is already
  running and MOZ_ENABLE_WAYLAND is set to 1

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