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.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

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.

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.