This bug was fixed in the package firefox - 13.0+build1-0ubuntu0.11.04.1

---------------
firefox (13.0+build1-0ubuntu0.11.04.1) natty-security; urgency=low

  * New upstream stable release (FIREFOX_13_0_BUILD1)
    - see LP: #1007495 for USN information

  [ Chris Coulson <email address hidden> ]
  * Update globalmenu-extension to 3.2.3
    - Reduce our memory footprint a bit, which wasn't really a lot anyway
    - Avoid the use of the component manager for accessing commonly used
      services, where "commonly used" means "accessed when building every
      menu item". This should save some CPU cycles when building or
      refreshing menus
    - Try to recycle menuitems when they are removed from a menu by
      adding contiguous blocks of removed items to a "free list" which
      is emptied asynchronously, and reusing the items in this list when
      new items are added in place of the removed items. This means that
      refreshing the history menu contents when the menu is opened no
      longer alters the menu structure, but results in a shifting of
      properties between existing nodes instead. This has a few benefits:
      + With no layout changes, unity-panel-service doesn't request
        the entire menu structure, which significantly reduces dbus traffic
        and makes it much faster to refresh the menu contents
      + The size of the menu doesn't change when it is refreshed, which
        eliminates the flicker that used to occur when opening the history
        menu.
    - Remove all use of the global observer service for sending our own
      internal notifications around
    - Clean up the way we ensure that the correct edit commands are
      enabled by just installing our own onpopupshowing handler rather
      than using an additional notification to fix things up after the
      default handler runs
    - Get rid of a static initializer
    - Don't support older than Firefox 11
    - Fix some GError leaks
    - Hide the internal menu when creating a native menu, rather than
      waiting for confirmation that the native menu is registered
      successfully. We don't try to create a native menu if we don't
      find a menu service to register the menu with anyway
    - Keep menu contents updated whilst the menu is open, rather than
      just whilst it is opening
    - Fix LP: #915888 - Handling of checkbox menuitems with a command
      node is wrong
  * Refresh build-depends:
    - Bump minimum GTK version to 2.14 as we build with GIO support
    - Add minimum requirement for glib (2.18)
    - Drop libidl-dev, this doesn't appear to be needed now
    - Bump minimum NSPR version to 4.9.0 for --enable-system-nspr builds
    - Bump minimum sqlite version to 3.7.10 for --enable-system-sqlite
      builds
    - Bump minimum NSS version to 3.13.2 for --enable-system-nss builds
  * Refresh patches:
    - update debian/patches/ubuntu-ua-string-changes.patch
    - update debian/patches/ubuntu-codes-google.patch
    - update debian/patches/firefox-kde.patch
    - update debian/patches/mozilla-kde.patch
    - update debian/patches/dont-include-hyphenation-patterns.patch
  * Clean up the file exclude list and add comments for excluded files
    - update debian/build/create-tarball.py
  * Make it easy to run Firefox in valgrind for builds that are compiled
    with explicit valgrind support
    - update debian/firefox.sh.in
  * Bump debhelper compat to 7
    - update debian/apport/blacklist.in
    - update debian/apport/source_firefox.py.in
    - update debian/compat
    - update debian/config/mozconfig.in
    - update debian/control.in
    - update debian/firefox-dev.install.in
    - update debian/firefox-dev.links.in
    - update debian/firefox-globalmenu.dirs.in
    - update debian/firefox-gnome-support.install.in
    - update debian/firefox.dirs.in
    - update debian/firefox.install.in
    - update debian/firefox.links.in
    - update debian/firefox.postinst.in
    - update debian/firefox.preinst.in
    - update debian/firefox.sh.in
    - update debian/pkgconfig/libxul.pc.in
    - update debian/pkgconfig/mozilla-nspr.pc.in
    - update debian/pkgconfig/mozilla-plugin.pc.in
    - update debian/rules
    - update debian/usr.bin.firefox.apparmor.10.04
    - update debian/usr.bin.firefox.apparmor.10.10
    - update debian/usr.bin.firefox.apparmor.11.04
    - update debian/usr.bin.firefox.apparmor.9.10
  * Override 2 embedded-library lintian errors
    - update debian/firefox.lintian-overrides.in
  * Drop debian/patches/distro-locale-searchplugins after landing of
    bmo: #515232
  * Don't hardcode general.useragent.locale to en-US, now that it's used
    for searchplugin localization. This means we can drop this pref from
    ubufox
    - add debian/patches/dont-override-general-useragent-locale.patch
    - update debian/patches/series
  * Drop patches fixed upstream
    - remove debian/patches/no-sps-profiler-on-unsupported-archs.patch
    - remove debian/patches/avoid-dbus-roundtrip-for-httpchannel.patch
    - update debian/patches/series
  * Apport hook improvements:
    - Add support for reporting preference defaults that are set by extensions
    - When reporting preferences, record the source of each preference
    - Report plugin packages for plugins that are installed with the
      package manager
    - Add some addon manager related prefs to the whitelist
    - Display additional metadata in the extensions report
    - Take "default-to-compatible" in to account when determining whether
      the user is running incompatible addons
    - Attach submitted crash ID's to bug reports
    - Report if files in the profile folder have broken permissions
  * Update compare-locales to 0.9.5
  * Fix make-makefile test failure when the build directory contains
    perl regexp control characters
    - add debian/patches/make-makefile-test-fix.patch
    - update debian/patches/series
  * Fix for NSS libs not being signed, breaking FIPS
    - update debian/rules

  [ Jamie Strandboge <email address hidden> ]
  * adjust apparmor profile to deny reads to @{PROC}/[0-9]*/net/dev. Patch
    thanks to James Troup (LP: #955066)
  * adjust apparmor profile to deny reads to @{PROC}/[0-9]*/net/wireless.
    Patch thanks to James Troup (LP: #974141)
 -- Chris Coulson <email address hidden>   Fri, 01 Jun 2012 18:31:55 +0100