Bug#802555: iceweasel icon (in window-manager overview tab list) is unclear

[Daniel Kahn Gillmor]

Package: iceweasel
Version: 41.0.2-1
Severity: minor

the attached screenshot shows me tab-cycling through windows.  In
previous versions of iceweasel, the iceweasel windows used to be
associated with icons that looked like the iceweasel.  now they just
have this odd white lump in the lower left-hand corner.

     --dkg

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (200, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.3.0-rc3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages iceweasel depends on:
ii  debianutils               4.5.1
ii  fontconfig                2.11.0-6.3
ii  libasound2                1.0.29-1
ii  libatk1.0-0               2.18.0-1
ii  libc6                     2.19-22
ii  libcairo2                 1.14.2-2
ii  libdbus-1-3               1.10.0-3
ii  libdbus-glib-1-2          0.102-1
ii  libevent-2.0-5            2.0.21-stable-2
ii  libffi6                   3.2.1-3
ii  libfontconfig1            2.11.0-6.3
ii  libfreetype6              2.6-2
ii  libgcc1                   1:5.2.1-22
ii  libgdk-pixbuf2.0-0        2.32.1-1
ii  libglib2.0-0              2.46.0-2
ii  libgtk2.0-0               2.24.28-1
ii  libhunspell-1.3-0         1.3.3-3+b1
ii  libnspr4                  2:4.10.9-2
ii  libnss3                   2:3.20-1
ii  libpango-1.0-0            1.38.0-3
ii  libsqlite3-0              3.8.11.1-1
ii  libstartup-notification0  0.12-4
ii  libstdc++6                5.2.1-22
ii  libvpx2                   1.4.0-4
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                1:5.0.1-2+b2
ii  libxrender1               1:0.9.8-1+b1
ii  libxt6                    1:1.1.4-1+b1
ii  procps                    2:3.3.10-2
ii  zlib1g                    1:1.2.8.dfsg-2+b1

Versions of packages iceweasel recommends:
pn  gstreamer1.0-libav         <none>
ii  gstreamer1.0-plugins-good  1.6.0-1

Versions of packages iceweasel suggests:
ii  fonts-lmodern          2.004.5-1
ii  fonts-stix [otf-stix]  1.1.1-4
ii  libcanberra0           0.30-2.1
ii  libgnomeui-0           2.24.5-3
ii  libgssapi-krb5-2       1.13.2+dfsg-2
pn  mozplugger             <none>
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