Bug#842616: Black line between chrome and content area

[Josh Triplett]

Package: firefox
Version: 49.0-5
Severity: normal

After the upgrade to 49.0-5 with GTK3, Firefox shows a thin black line
between the browser chrome and the content area.  Screenshot attached.

This does not depend on the content displayed or the size of the window;
it always appears.

Firefox 50 in experimental doesn't seem to have this problem.

- Josh Triplett

-- Package-specific info:

-- Extensions information
Name: Adblock Plus
Location: /usr/share/xul-ext/adblock-plus
Package: xul-ext-adblock-plus
Status: enabled

Name: Default theme
Location: /usr/lib/firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi
Package: firefox
Status: enabled

Name: HTTPS Everywhere
Location: ${PROFILE_EXTENSIONS}/https-everywhere at eff.org.xpi
Status: enabled

Name: It's All Text!
Location: /usr/share/xul-ext/itsalltext
Package: xul-ext-itsalltext
Status: enabled

Name: Multi-process staged rollout
Location: ${PROFILE_EXTENSIONS}/e10srollout at mozilla.org.xpi
Status: enabled

Name: Pocket
Location: ${PROFILE_EXTENSIONS}/firefox at getpocket.com.xpi
Status: enabled

Name: Web Compat
Location: ${PROFILE_EXTENSIONS}/webcompat at mozilla.org.xpi
Status: enabled

-- Plugins information
Name: GNOME Shell Integration
Location: /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so
Package: gnome-shell
Status: enabled

Name: iTunes Application Detector
Location: /usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so
Package: rhythmbox-plugins
Status: enabled


-- Addons package information
ii  firefox        49.0-5       amd64        Mozilla Firefox web browser
ii  gnome-shell    3.22.1-1     amd64        graphical shell for the GNOME des
ii  rhythmbox-plug 3.4.1-2      amd64        plugins for rhythmbox music playe
ii  xul-ext-adbloc 2.7.3+dfsg-1 all          advertisement blocking extension 
ii  xul-ext-itsall 1.9.2-2      all          extension to edit textareas using

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages firefox depends on:
ii  debianutils               4.8
ii  fontconfig                2.11.0-6.7
ii  libasound2                1.1.2-1
ii  libatk1.0-0               2.22.0-1
ii  libc6                     2.24-5
ii  libcairo-gobject2         1.14.6-1+b1
ii  libcairo2                 1.14.6-1+b1
ii  libdbus-1-3               1.10.12-1
ii  libdbus-glib-1-2          0.108-1
ii  libevent-2.0-5            2.0.21-stable-2+b1
ii  libffi6                   3.2.1-6
ii  libfontconfig1            2.11.0-6.7
ii  libfreetype6              2.6.3-3+b1
ii  libgcc1                   1:6.2.0-10
ii  libgdk-pixbuf2.0-0        2.36.0-1
ii  libglib2.0-0              2.50.1-1
ii  libgtk-3-0                3.22.2-1
ii  libgtk2.0-0               2.24.31-1
ii  libhunspell-1.4-0         1.4.1-2+b1
ii  libnspr4                  2:4.12-6
ii  libnss3                   2:3.26.2-1
ii  libpango-1.0-0            1.40.3-3
ii  libsqlite3-0              3.15.0-1
ii  libstartup-notification0  0.12-4
ii  libstdc++6                6.2.0-10
ii  libvpx4                   1.6.0-2
ii  libx11-6                  2:1.6.3-1
ii  libxcomposite1            1:0.4.4-1
ii  libxdamage1               1:1.1.4-2+b1
ii  libxext6                  2:1.3.3-1
ii  libxfixes3                1:5.0.2-1
ii  libxrender1               1:0.9.9-2
ii  libxt6                    1:1.1.5-1
ii  procps                    2:3.3.12-2
ii  zlib1g                    1:1.2.8.dfsg-2+b1

firefox recommends no packages.

Versions of packages firefox suggests:
pn  fonts-lmodern          <none>
pn  fonts-stix | otf-stix  <none>
ii  libcanberra0           0.30-3
pn  libgnomeui-0           <none>
ii  libgssapi-krb5-2       1.14.3+dfsg-2
pn  mozplugger             <none>

-- no debconf information
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