firefox page load with old pencil extension (1.3.2) leaks memory fast

[Scott Moser]

In my firefox (current quantal as of today '14.0~b9+build1-0ubuntu1'), if I load the page at
   http://www.thegeekstuff.com/2010/02/awk-conditional-statements/

my X almost immediately starts consuming all CPU, making it almost impossible to do anything. I was able to hit 'ctrl-alt-f1' and then log in and run 'top' to see X spinning.

Loading the same page later in the day (on accident), I let it run its course, and eventually firefox was killed via OOM, and the system generally returned to normal.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: firefox 14.0~b9+build1-0ubuntu1
ProcVersionSignature: Ubuntu 3.4.0-5.11-generic 3.4.0
Uname: Linux 3.4.0-5-generic x86_64
ApportVersion: 2.2.5-0ubuntu1
Architecture: amd64
BuildID: 20120625123548
Date: Mon Jun 25 21:16:50 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles:
 Profile0 (Default) - LastVersion=14.0/20120625123548
 Profile1 - LastVersion=6.0/20110725191936 (Out of date)
 Profile2 - LastVersion=13.0/20120601175215 (Out of date)
SourcePackage: firefox
UpgradeStatus: Upgraded to quantal on 2011-11-07 (231 days ago)

[Scott Moser (smoser)]

This alone probably isn't useful, but maybe it at least gives some hints.
I'm attaching :
  wget http://www.thegeekstuff.com/2010/02/awk-conditional-statements/

[Scott Moser (smoser)]

I'm marking this fix released.
I narrowed it down to the 'pencil' exstension that I had installed (http://pencil.evolus.vn/en-US/Home.aspx). I had previously had 1.3.2 installed, but now have 1.3.4, which is current.

Upgrading that seemingly innocent fixed this massive memory leak.