Bug#700327: iceweasel: Browsing 9gag.com causes X to use up to 100% of CPU

[Aaron]

Package: iceweasel
Version: 18.0.2-1
Severity: important

As the subject says, browsing 9gag.com causes X to use up to 100% of CPU.
I think http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=697910 may be 
related to this one, as I also encountered the issue described there.
I've tried to run iceweasel with plugins disabled but the problem still 
persists.

-- Package-specific info:

-- Extensions information
Name: Adblock Plus
Location: ${PROFILE_EXTENSIONS}/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}.xpi
Status: enabled

Name: Anime musica theme
Status: enabled

Name: Default theme
Location: 
/usr/lib/iceweasel/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}
Package: iceweasel
Status: user-disabled

Name: FireTray
Location: 
/usr/lib/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/{9533f794-00b4-4354-aa15-c2bbda6989f8}
Package: xul-ext-firetray
Status: app-disabled

Name: Japanese Language Pack locale
Location: 
/usr/lib/iceweasel/extensions/langpack-ja at iceweasel.mozilla.org.xpi
Package: iceweasel-l10n-ja
Status: enabled

-- Plugins information
Name: Google Talk Plugin
Location: /opt/google/talkplugin/libnpgoogletalk.so
Package: google-talkplugin
Status: disabled

Name: Google Talk Plugin Video Accelerator
Location: /opt/google/talkplugin/libnpgtpo3dautoplugin.so
Package: google-talkplugin
Status: disabled

Name: IcedTea-Web Plugin (using IcedTea-Web 1.3.1 (1.3.1-2.1))
Location: /usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
Package: icedtea-6-plugin:amd64
Status: disabled

Name: Shockwave Flash
Location: /usr/lib/flashplugin-nonfree/libflashplayer.so
Status: enabled

Name: Skype Buttons for Kopete
Location: /usr/lib/mozilla/plugins/skypebuttons.so
Package: kopete
Status: disabled


-- Addons package information
ii  google-talkplu 3.10.2.0-1   amd64        Google Talk Plugin
ii  icedtea-6-plug 1.3.1-2.1    amd64        web browser plugin based on 
OpenJ
ii  iceweasel      18.0.2-1     amd64        Web browser based on Firefox
ii  iceweasel-l10n 1:18.0.2-1   all          Japanese language package 
for Ice
ii  kopete         4:4.8.4-1+b1 amd64        instant messaging and chat 
applic
ii  xul-ext-firetr 0.3.6-2      amd64        system tray extension for 
Thunder

-- System Information:
Debian Release: 7.0
   APT prefers unstable
   APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-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

Versions of packages iceweasel depends on:
ii  debianutils         4.3.4
ii  fontconfig          2.9.0-7.1
ii  libc6               2.13-38
ii  libgdk-pixbuf2.0-0  2.26.1-1
ii  libglib2.0-0        2.33.12+really2.32.4-5
ii  libgtk2.0-0         2.24.10-2
ii  libnspr4            2:4.9.4-2
ii  libnspr4-0d         2:4.9.4-2
ii  libsqlite3-0        3.7.15.2-1
ii  libstdc++6          4.7.2-5
ii  procps              1:3.3.4-2
ii  xulrunner-18.0      18.0.2-1

iceweasel recommends no packages.

Versions of packages iceweasel suggests:
pn  fonts-stix | otf-stix <none>
ii  libgssapi-krb5-2       1.10.1+dfsg-3
pn  mozplugger <none>

Versions of packages xulrunner-18.0 depends on:
ii  libasound2                1.0.25-4
ii  libatk1.0-0               2.4.0-2
ii  libbz2-1.0                1.0.6-4
ii  libc6                     2.13-38
ii  libcairo2                 1.12.2-3
ii  libdbus-1-3               1.6.8-1
ii  libdbus-glib-1-2          0.100-1
ii  libevent-2.0-5            2.0.19-stable-3
ii  libfontconfig1            2.9.0-7.1
ii  libfreetype6              2.4.9-1.1
ii  libgcc1                   1:4.7.2-5
ii  libgdk-pixbuf2.0-0        2.26.1-1
ii  libglib2.0-0              2.33.12+really2.32.4-5
ii  libgtk2.0-0               2.24.10-2
ii  libhunspell-1.3-0         1.3.2-4
ii  libmozjs18d               18.0.2-1
ii  libnspr4                  2:4.9.4-2
ii  libnss3                   2:3.14.1.with.ckbi.1.93-1
ii  libpango1.0-0             1.30.0-1
ii  libpixman-1-0             0.26.0-3
ii  libsqlite3-0              3.7.15.2-1
ii  libstartup-notification0  0.12-1
ii  libstdc++6                4.7.2-5
ii  libvpx1                   1.1.0-1
ii  libx11-6                  2:1.5.0-1
ii  libxext6                  2:1.3.1-2
ii  libxrender1               1:0.9.7-1
ii  libxt6                    1:1.1.3-1
ii  zlib1g                    1:1.2.7.dfsg-13

Versions of packages xulrunner-18.0 suggests:
ii  libcanberra0  0.28-6
ii  libgnomeui-0  2.24.5-2

-- no debconf information