Blocklisting/Testing

Testing Staged Blocklist

To test a staged block:

1. Go to about:config, find the extensions.blocklist.url pref and change the addons.mozilla.org part of the value to addons-dev.allizom.org

Forcing a Blocklist Ping

1. Open Error Console
2. Paste and run this snippet:

 Components.classes["@mozilla.org/extensions/blocklist;1"].getService(Components.interfaces.nsITimerCallback).notify(null);

Testing Graphics Blocklist entries

(Note: this only applies to Windows.)

1. If the blocklist entry is on staging, see above for testing a staged blocklist first.
2. Ensure you're currently hardware accelerated by opening about:support and looking at the Graphics section. Check that you have:
   1. Direct2D true (if on Windows 7 or Vista with the platform update)
   2. Hardware accelerated windows 1/1 Direct3D 9 (or 10)
3. Force a blocklist ping, as above.
4. Wait 5 seconds.
5. Restart your browser.
6. Open about:support and look at the Graphics section again. Ensure that:
   1. Direct2D is false
   2. Hardware accelerated windows 0/1

Quickly Checking Features

In addition to the above section, features can also be checked for disabled/enabled status by the following:

Feature	Enabled	Disabled
Direct2D (Windows)	about:support will show "Direct2D Enabled: true"	about:support will show "Direct2D Enabled: false"
Direct3D 9 Layers (Windows)	about:support will show "GPU Accelerated Windows: 2/2 Direct3D 9" *if it says Direct3D 10, this is not possible to test on this setup	about:support will show "GPU Accelerated Windows: 0/2" and will not list the rendering API
Direct3D 10 Layers (Windows)	about:support will show "GPU Accelerated Windows: 2/2 Direct3D 10" *if it says Direct3D 9, this is not possible to test on this setup	about:support will show "GPU Accelerated Windows: 0/2" and will not list the rendering API
Direct3D 10.1 Layers (Windows)	about:support will show "GPU Accelerated Windows: 2/2 Direct3D 10" *if it says Direct3D 9, this is not possible to test on this setup	about:support will show "GPU Accelerated Windows: 0/2" and will not list the rendering API
OpenGL Layers (Android, Linux, Mac)	about:support will show "GPU Accelerated Windows: 1/1 OpenGL"	about:support will show "GPU Accelerated Windows: 0/1" and will not list the rendering API
WebGL, OpenGL Variant (Android, Linux, Mac, sometimes Windows)	about:support will show "WebGL Renderer: <your renderer>" and it will not contain anything about being blocked for a driver version or similar messages *NOTE: if it contains the word "ANGLE" on windows, it is NOT using OpenGL, even if after that it says "OpenGL ES 2.0" or some such	about:support will show "WebGL Renderer: <some error>" which contains some information about why the renderer is blocked
WebGL, ANGLE Variant (Windows)	about:support will show "WebGL Renderer: ANGLE( <your render> )" and will not contain anything about being blocked for a driver version or similar messages. *NOTE: DO NOT assume that if it says "OpenGL ES 2.0" or some such that it is using OpenGL; the only important thing is that it says "ANGLE"	about:support will show "WebGL Renderer: <some error>" which contains some information about why the renderer is blocked
WebGL MSAA	Go to https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/demos/mozilla/spore/index.html and compare the model to this reference; if it looks like the left image, MSAA is enabled.	Go to https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/demos/mozilla/spore/index.html and compare the model to this reference; if it looks like the right image, MSAA is disabled. *NOTE: this is not a scientific test. MSAA may be disabled but you cannot be certain that it's blocked. the card could simply not support it. the best way to be sure is to download a utility that checks your GPU's available extensions and if antialiasing is not in that list, it is simply not supported

• NOTE: Direct3D 10 and Direct3D 10.1 are impossible to distinguish visually.

Spoofing Hardware Details for Blocklist Testing

Sometimes you don't have hardware or software available to test a given blocklist entry. On Windows, you can spoof your hardware and software details to the graphics blacklist using environment variables.

r

Environment Variable	Sample Value(s)	Meaning
MOZ_GFX_SPOOF_DRIVER_VERSION	8.17.18.2563	The version of the driver you want to spoof.
MOZ_GFX_SPOOF_VENDOR_ID	0x1002	The PCI vendor ID of the card you want to spoof.
MOZ_GFX_SPOOF_DEVICE_ID	0x3245	The PCI device ID of the card you want to spoof.
MOZ_GFX_SPOOF_WINDOWS_VERSION	Windows 2000 0x50000 Windows XP 0x50001 Windows Server 2003 0x50002 Windows Vista 0x60000 Windows 7 0x60001	The numeric ID of the Windows version you want to spoof.