DXDIAG

System Information

Time of this report: 9/12/2012, 16:10:06

      Machine name: DAVID-PC
  Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
          Language: English (Regional Setting: English)

System Manufacturer: System manufacturer

      System Model: System Product Name
              BIOS: BIOS Date: 01/28/10 16:55:55 Ver: 08.00.15
         Processor: Intel(R) Core(TM) i7 CPU         930  @ 2.80GHz (8 CPUs), ~2.8GHz
            Memory: 12288MB RAM

Available OS Memory: 12280MB RAM

         Page File: 6182MB used, 18373MB available
       Windows Dir: C:\Windows
   DirectX Version: DirectX 11

DX Setup Parameters: Not found

  User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
   DWM DPI Scaling: Disabled
    DxDiag Version: 6.01.7601.17514 64bit Unicode

DxDiag Notes

     Display Tab 1: No problems found.
       Sound Tab 1: No problems found.
       Sound Tab 2: No problems found.
       Sound Tab 3: No problems found.
       Sound Tab 4: No problems found.
         Input Tab: No problems found.

DirectX Debug Levels

Direct3D: 0/4 (retail) DirectDraw: 0/4 (retail) DirectInput: 0/5 (retail) DirectMusic: 0/5 (retail) DirectPlay: 0/9 (retail) DirectSound: 0/5 (retail) DirectShow: 0/6 (retail)

Display Devices

         Card name: ATI Radeon HD 5700 Series
      Manufacturer: Advanced Micro Devices, Inc.
         Chip type: AMD Radeon Graphics Processor (0x68B8)
          DAC type: Internal DAC(400MHz)
        Device Key: Enum\PCI\VEN_1002&DEV_68B8&SUBSYS_E147174B&REV_00
    Display Memory: 3785 MB
  Dedicated Memory: 1997 MB
     Shared Memory: 1787 MB
      Current Mode: 1920 x 1080 (32 bit) (60Hz)
      Monitor Name: Generic PnP Monitor
     Monitor Model: Acer H213H
        Monitor Id: ACR0082
       Native Mode: 1920 x 1080(p) (60.000Hz)
       Output Type: HDMI
       Driver Name: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll

Driver File Version: 8.17.0010.1140 (English)

    Driver Version: 8.982.0.0
       DDI Version: 11
      Driver Model: WDDM 1.1
 Driver Attributes: Final Retail
  Driver Date/Size: 7/27/2012 22:13:56, 1100288 bytes
       WHQL Logo'd: Yes
   WHQL Date Stamp: 
 Device Identifier: {D7B71EE2-2BF8-11CF-8F70-4DC1BEC2C535}
         Vendor ID: 0x1002
         Device ID: 0x68B8
         SubSys ID: 0xE147174B
       Revision ID: 0x0000
Driver Strong Name: oem11.inf:ATI.Mfg.NTamd64.6.1:ati2mtag_Evergreen:8.982.0.0:pci\ven_1002&dev_68b8
    Rank Of Driver: 00E62001
       Video Accel: ModeMPEG2_A ModeMPEG2_C 
  Deinterlace Caps: {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                    {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch 
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY 
                    {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                    {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch 
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY 
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {3C5323C1-6FB7-44F5-9081-056BF2EE449D}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                    {552C0DAD-CCBC-420B-83C8-74943CF9F1A6}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                    {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                    {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch 
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY 
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
                    {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=
      D3D9 Overlay: Not Supported
           DXVA-HD: Not Supported
      DDraw Status: Enabled
        D3D Status: Enabled
        AGP Status: Enabled

Try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://hacks.mozilla.org/2010/09/hardware-acceleration/

• https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

See also :

• http://kb.mozillazine.org/Firefox_crashes
• https://support.mozilla.org/kb/Firefox+crashes

I uninstalled Catalyst 12.8 and reinstalled 12.2 and haven't had a crash since. (Knock on wood!!)

Still no crashes since I re-installed the older Catalyst drivers.

Confirming that disabling Hardware acceleration solves this problem.

Which is much better than going back to a previous driver IMO.

Firefox 15.0.1 Catalyst 12.8 Windows 7 64-bit