Package: firefox
Version: 69.0.1-1
Severity: normal

Hello,

I have configured my gnome DE to lower a window when middle-clicking on
the title bar. (There are less and less programs that still act on this
setting, but that's a different story.)

I just noticed that when firefox is covered by another window (in my
case thunderbird) and the title bars are aligned (which is not that
uncommon at the upper edge of the desktop) and I lower the covering
window with a middle click the window moves below the firefox window on
button-press, then the mouse is over a tab and on button-release this
tab is closed. So the click has an influence on two windows and the
second one isn't even visible when I press the mouse button.

Additionally this is not always immediately obvious to notice that you
lost a browser tab. (I only noticed because I had an audio file playing
in that tab and the music stopped.)

Not entirely sure this is a firefox bug, the problem might actually be
in wayland or gnome?!

Best regards
Uwe

-- Package-specific info:

-- Extensions information
Name: Amazon.com
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

Name: Bing
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

Name: Dark theme
Location: /usr/lib/firefox/browser/omni.ja
Status: user-disabled

Name: Default theme
Location: /usr/lib/firefox/omni.ja
Status: enabled

Name: DuckDuckGo
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

Name: Firefox Monitor
Location: /usr/lib/firefox/browser/features/fxmoni...@mozilla.org.xpi
Status: enabled

Name: Firefox Screenshots
Location: /usr/lib/firefox/browser/features/screensh...@mozilla.org.xpi
Status: enabled

Name: Form Autofill
Location: /usr/lib/firefox/browser/features/formautof...@mozilla.org.xpi
Status: enabled

Name: FoxyProxy Standard
Location: ${PROFILE_EXTENSIONS}/foxypr...@eric.h.jung.xpi
Status: enabled

Name: GNOME Shell integration
Location: ${PROFILE_EXTENSIONS}/chrome-gnome-sh...@gnome.org.xpi
Status: enabled

Name: Google
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

Name: Light theme
Location: /usr/lib/firefox/browser/omni.ja
Status: user-disabled

Name: Twitter
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

Name: uBlock Origin
Location: 
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ublo...@raymondhill.net
Status: enabled

Name: Web Compat
Location: /home/uwe/.mozilla/firefox/gvflbpfb.Default 
User/features/{8ddd1bf1-9654-4993-8e9a-234918bddeb7}/webcom...@mozilla.org.xpi
Status: enabled

Name: WebCompat Reporter
Location: /usr/lib/firefox/browser/features/webcompat-repor...@mozilla.org.xpi
Status: user-disabled

Name: Wikipedia (en)
Location: /usr/lib/firefox/browser/omni.ja
Status: enabled

-- Plugins information

-- Addons package information

-- System Information:
Debian Release: 10.1
  APT prefers stable
  APT policy: (700, 'stable'), (600, 'unstable'), (500, 'unstable-debug'), 
(500, 'stable-debug'), (500, 'oldstable-updates'), (500, 'oldstable'), (499, 
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages firefox depends on:
ii  debianutils               4.8.6.1
ii  fontconfig                2.13.1-2
ii  libasound2                1.1.8-1
ii  libatk1.0-0               2.30.0-2
ii  libc6                     2.29-2
ii  libcairo-gobject2         1.16.0-4
ii  libcairo2                 1.16.0-4
ii  libdbus-1-3               1.12.16-1
ii  libdbus-glib-1-2          0.110-4
ii  libevent-2.1-6            2.1.8-stable-4
ii  libffi6                   3.2.1-9
ii  libfontconfig1            2.13.1-2
ii  libfreetype6              2.9.1-3
ii  libgcc1                   1:8.3.0-6
ii  libgdk-pixbuf2.0-0        2.38.1+dfsg-1
ii  libglib2.0-0              2.58.3-2+deb10u1
ii  libgtk-3-0                3.24.5-1
ii  libnspr4                  2:4.21-1
ii  libnss3                   2:3.45-1
ii  libpango-1.0-0            1.42.4-7~deb10u1
ii  libsqlite3-0              3.29.0-2
ii  libstartup-notification0  0.12-6
ii  libstdc++6                9.2.1-8
ii  libx11-6                  2:1.6.7-1
ii  libx11-xcb1               2:1.6.7-1
ii  libxcb-shm0               1.13.1-2
ii  libxcb1                   1.13.1-2
ii  libxcomposite1            1:0.4.4-2
ii  libxdamage1               1:1.1.4-3+b3
ii  libxext6                  2:1.3.3-1+b2
ii  libxfixes3                1:5.0.3-1
ii  libxrender1               1:0.9.10-1
ii  libxt6                    1:1.1.5-1+b3
ii  procps                    2:3.3.15-2
ii  zlib1g                    1:1.2.11.dfsg-1

Versions of packages firefox recommends:
ii  libavcodec57  7:3.4.3-1
ii  libavcodec58  7:4.1.4-1~deb10u1

Versions of packages firefox suggests:
ii  fonts-lmodern          2.004.5-6
pn  fonts-stix | otf-stix  <none>
ii  libcanberra0           0.30-7
ii  libgssapi-krb5-2       1.17-3
ii  libgtk2.0-0            2.24.32-3
ii  pulseaudio             12.2-4+deb10u1

-- no debconf information

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