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[N Massart <845592@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Firefox process rises to 100% CPU usage sometimes when switching from one tab to another even if the pages loadings are finished. But this is not happening at any tab switching.
I tried disabling any extensions and plugins (so Flash is not in cause this time), but the same overload happens.
After a few minutes (2 or 3 max), the process CPU load comes back to normal... until next time.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
Architecture: amd64
Date: Fri Sep  9 14:55:16 2011
FirefoxPackages:
 firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
 flashplugin-installer 10.3.183.7ubuntu0.11.04.1
 adobe-flashplugin N/A
 icedtea-plugin 1.1.1-0ubuntu1~11.04.1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=fr_FR:en
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty

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https://bugs.launchpad.net/bugs/845592

Title:
  Firefox 6.0.2 process rises to 100% of CPU use when switching tab

Status in “firefox” package in Ubuntu:
  New

Bug description:
  Firefox process rises to 100% CPU usage sometimes when switching from one tab to another even if the pages loadings are finished. But this is not happening at any tab switching.
  I tried disabling any extensions and plugins (so Flash is not in cause this time), but the same overload happens.
  After a few minutes (2 or 3 max), the process CPU load comes back to normal... until next time.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  Architecture: amd64
  Date: Fri Sep  9 14:55:16 2011
  FirefoxPackages:
   firefox 6.0.2+build2+nobinonly-0ubuntu0.11.04.1
   flashplugin-installer 10.3.183.7ubuntu0.11.04.1
   adobe-flashplugin N/A
   icedtea-plugin 1.1.1-0ubuntu1~11.04.1
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcEnviron:
   LANGUAGE=fr_FR:en
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)

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