This bug was fixed in the package firefox - 12.0+build1-0ubuntu0.10.04.1

---------------
firefox (12.0+build1-0ubuntu0.10.04.1) lucid-security; urgency=low

  * New upstream stable release (FIREFOX_12_0_BUILD1)
    - see LP: #987262 for USN information

  [ Chris Coulson <email address hidden> ]
  * Make sure to add a binary libgconf2-4 dependency as dpkg-shlibdeps won't
    do this for us now
    - update debian/rules
    - update debian/control{,.in}
  * Firefox recommends libcanberra0 now that bmo: #635918 has landed
    - update debian/control{,in}
  * Clean up search plugin installation now that we build our own
    language packs:
    - Drop the recursive symlink from /usr/lib/firefox-addons/searchplugins,
      which lintian kept complaining about
    - Don't effectively symlink distribution/searchplugins to searchplugins,
      as they have different layouts and this avoids the same data being
      iterated over twice
    - Revert to the upstream layout in distribution/searchplugins
      - add debian/firefox-locale.preinst.in, which will end up in all
        language packs to assist the symlink -> folder transition
      - update debian/firefox.dirs.in
      - update debian/firefox.install.in
      - update debian/firefox.links.in
      - update debian/firefox.preinst.in
      - update debian/patches/distro-locale-searchplugins.patch
      - update debian/rules
  * Fix LP: #894166 - Make Firefox work with our system hyphenation patterns,
    and stop including our own
    - update debian/vendor.js
    - add debian/patches/dont-include-hyphenation-patterns.patch
    - update debian/patches/series
  * Fix LP: #807733 - Firefox doesn't restart after upgrades where the version
    changes. Don't include the version number in the install path, as Firefox
    cannot re-exec itself.
    - update debian/firefox-dev.install.in
    - update debian/firefox-dev.links.in
    - update debian/firefox-locale.preinst.in
    - update debian/firefox.lintian-overrides.in
    - update debian/firefox.preinst.in
    - update debian/rules
  * Expose distribution/extensions in /usr/lib/firefox-addons, to allow
    administrators to add extensions that they want to add to default user
    profiles, and that they want the addon manager to keep updated. We lost
    this functionality when upgrading from Firefox 3.6, due to the loss of
    /etc/firefox/profile
    - update debian/firefox.dirs.in
    - update debian/firefox.install.in
    - update debian/firefox.links.in
    - update debian/firefox.postinst.in
  * Refresh patches
    - update debian/patches/firefox-kde.patch
    - update debian/patches/mozilla-kde.patch
    - update debian/patches/no-sps-profiler-on-unsupported-archs.patch
    - update debian/patches/ubuntu-codes-google.patch
    - update debian/patches/ubuntu-bookmarks.patch
    - update debian/patches/ubuntu-codes-amazon/patch
  * Massively simplify distro-locale-searchplugins.patch, as we don't need
    to swap the loading order of common / locale-specific searchplugin
    paths. $LIBDIR/distribution/searchplugins/common is no longer a symlink
    to $LIBDIR/searchplugins, so there is no need to have the ability for
    locale-specific plugins to override common ones. They already override
    those in $LIBDIR/searchplugins
    - update debian/patches/distro-locale-searchplugins.patch
  * Refresh locales
    - refresh debian/config/locales.all
    - refresh debian/control
  * Make the language packs Architecture: any. Whilst they are actually
    architecture independent, we do install them in to /usr/lib (as the
    extensions location is shared with architecture-specific extensions).
    This also avoids the problem of offering incompatible language pack
    upgrades to users on architectures where Firefox fails to build
    (I'm looking at you, powerpc)
    - update debian/control.langpacks
    - update debian/control.langpacks.unavail
    - update debian/rules
    - refresh debian/control
  * Disable fix-build-failure-without-yarr-jit.patch, as it needs some work.
    This means that there is currently no powerpc support

  [ Jamie Strandboge <email address hidden> ]
  * debian/usr.bin.firefox.apparmor.*:
    - allow access to statm and smaps for about:memory (LP: #911494)
    - allow read access to files in /opt (LP: #728485)
 -- Chris Coulson <email address hidden>   Mon, 23 Apr 2012 13:43:45 +0100