** Description changed:

- When starting up Firefox or Thunderbird,the system freezes. First the
- cursor usually freezes and no input is possible, but the desktop display
- remains, sometimes for a few seconds. Then a pattern of horizontal bars
- appears on the screen. The bars are about two or three inches wide and
- about an eighth of an inch high, in various shades of color or black and
- white.
+ When starting up either Firefox or Thunderbird,the system freezes. First
+ the cursor usually freezes and no input is possible, but the desktop
+ display remains, sometimes for a few seconds. Then a pattern of
+ horizontal bars appears on the screen. The bars are about two or three
+ inches wide and about an eighth of an inch high, in various shades of
+ color or black and white. Each thin horizontal bar looks like it is a
+ sliver copied from the display picture that existed on the screen before
+ the crash.
  
  System almost always crashes when I click on an e-mail link in
  Thunderbird, as soon as the system attempts to start up the Firefox
  browser.
  
  System frequently crashes if I attempt to start up either Firefox or
- Thunderbird after I have previous run either.
+ Thunderbird after I have previously run the other application. So, if I
+ run Thunderbird and close it, then try to run Firefox, a crash occurs.
+ Or if I run Firefox and close it, then try to run Thunderbird, I get a
+ crash.
  
  System occasionally crashes the first time I try to run either Firefox
- or Thunderbird, even when I have never opened either during a session.
+ or Thunderbird, even when I have never opened either application
+ previously during the session.
  
  Basically, I can only use either Firefox or Thunderbird once, or
  sometimes twice, per session, before the system freezes and requires a
  cold boot.
  
  Pressing Alt+SysRq+1 followed by Alt+SysRq+t does nothing. It is a total
  system freeze and requires a cold boot.
  
  Problem began after installing upgrade to Ubuntu 13.04 (raring).
  
  My system is:
     Ubuntu 13.04 (raring)
     Gnome 3.6.3
     Kernel 3.8.0-19 generic
     GCC Version 1.13.3
  
     CPU Athentic AMD
     Model AMD Athlon 7850 Dual-Core
  
     Graphics Card: NVIDIA C61 (GeForce 7025 / nForce 630a)

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https://bugs.launchpad.net/bugs/1176062

Title:
  13.04 (raring) system crash with Firefox or Thunderbird

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