QA/Platform/Graphics/Firefox 41

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Windows XP Anethron, Centurion, Frostmane, Geico, Max Payne, McBain, Onyxia, Piglet, Praetor, Warlock
Windows Vista Dragonmaw, Lothar, Norwegia, Silvermoon, Wario
Windows 7 32-bit Kal-el, MiniHP, Palpatine, Shadowsong
Windows 7 64-bit Isiset, Satesh, Terminus, Zito
Windows 8 32-bit Higgins, Skywall
Windows 8 64-bit Assad, Marwyn, Medivh, Siamat, Vader

Set up the test environment

1. Install Firefox
  • Download the latest Beta from
  • Run installer and select customize
  • Put the install in a known directory (C:\FirefoxBeta for purposes of this example)
  • Do NOT allow it to launch Firefox at the end of the install
2. Disable the automatic updater
  • Open C:\FirefoxBeta\defaults\pref\channel-prefs.js in a text editor
  • Change the line reading pref("", "beta"); to pref("", "foobar");
  • Save and Close the text file
3. Launch Firefox with a clean profile
  • Run cmd.exe
  • Change directory to the folder where you installed Firefox: cd C:\FirefoxBeta
  • Run firefox.exe: firefox.exe -P -no-remote - This will bring up our profile selector window.
  • Use the "Create Profile" button to create a profile new profile
  • Once the profile is created, select it, and then click "Start Firefox"


1. Start with a new profile (see above), load the about:config page and verify the value of layers.d3d11.disable-warp:

  • Windows 8 and above should be false by default
  • Windows 7 and below should be true by default

2. Resize the window so it's at least 1024x768

3. Go to, scroll up and down for ~15 seconds, resize the window to a random size

4. Open another tab and go to, scroll up and down for ~15 seconds, resize the window to a random size

5. Switch back and forth between the two tabs three times

6. In tab, go to and play this video, this video, and some other random video for 15 seconds

  • Note: If a video plays with Flash find another video to test. To check, right mouse click on the video and choose “Stats for nerds”. The video is valid if the mime type is video/mp4 or video/webm.

7. Go to Google Maps, explore any location with Street View and Image View, resize the window to a random size

8. Update your graphics driver to the latest available version

  • Note: don't restart Firefox or your computer if it can be avoided. If Firefox crashes, report the crash, restart Firefox and continue on to step 9.

9. Repeat the test from step 3 through 7.

  • Note: if Firefox crashes, report the crash, restart Firefox and repeat steps 3 through 7.

10. Open the about:support page and scroll down to the Graphics section, if there are any errors reported include this information when you submit the form below.

11. Quit Firefox after all steps have been completed.

Fill out this form once you've completed the test (one response per system please).

Reporting Bugs

Report bugs for the following issues:

  • crashes on startup, shutdown, or when using Firefox
  • issues rendering or scrolling content
  • issues with video playback
  • layers.d3d11.disable-warp has an unexpected value

You can use this template to file your bug report.

  • be sure to attach a copy of your about:support and dxdiag log in the bug report
  • if the bug is a crash, be sure to include links to your crash reports from the about:crashes page



Full Query
ID Summary Priority Status
1184193 Some Windows 7 systems running WARP when they shouldn't be -- RESOLVED
1184618 Some images on show striping artifacts -- RESOLVED
1185017 Crash when resizing browser while entering Google Street View after updating driver with browser open -- RESOLVED
1219959 Youtube videos max resolution is 360p Mozilla Firefox 41.0.2 for Ubuntu -- RESOLVED

4 Total; 0 Open (0%); 4 Resolved (100%); 0 Verified (0%);