[Precise] 12.04.1 LTS, firefox 15.0.1

Randomly occurs on launchpad pages here, affects navigation keys, no
indications in log files like xsession-errors, syslog.

Example #1
Open a page in a tab, leave it, switch to another already open tab, read the 
content or type something for a while (more than 10 minutes), go back to the 
recent opened tab, scroll with arrow-keys or page-up -down - no reaction.

Example #2
Open a page in a new tab, press the end navigation key, the page moves as 
expected to the end of the page. Then press the arrow-up key for a short time 
in order to scroll up a bit, but instead the page moves all away to the 
beginning.

Example #3
Open a page in a new tab, tap for a short time on arrow-down key, it's expected 
that the page moves a bit down, but instead it moves all away to the end.
Then when using the arrow-up key it behaves as expected.

firefox:
  Installed: 15.0.1+build1-0ubuntu0.12.04.1
  Candidate: 15.0.1+build1-0ubuntu0.12.04.1
  Version table:
 *** 15.0.1+build1-0ubuntu0.12.04.1 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 
Packages
        500 http://archive.ubuntu.com/ubuntu/ precise-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     11.0+build1-0ubuntu4 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

Example image of keyboard layout.
https://secure.wikimedia.org/wikipedia/en/w/index.php?title=File:ISO_keyboard_%28105%29_QWERTY_UK.svg&page=1

** Attachment added: "Xorg.0.log"
   
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1057769/+attachment/3386879/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1057769

Title:
  Firefox key up / down / page up / page down don't work in web page

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  Firefox key up / down / page up / page down don't work in web page.

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