Suggested Systems

NOTE: Target systems with ANGLE WebGL renderer in about:support::Graphics

Run tests once with the latest GPU driver available and a second time with whichever older driver version you have access.

System	Platform	CPU	GPU
Lothar	Windows 7 32-bit	Intel C2D 2.13GHz	NVidia GeForce 7300LE 256MB
Marwyn	Windows 7 64-bit	AMD Phenom II X4 3.00GHz	AMD Radeon HD3450 256MB
Vader	Windows 8.1 64-bit	Intel Core i5-460M 2.53GHz	Intel HD / NVidia Geforce GT 420M 1024MB hybrid
Onyxia	Windows XP SP3	AMD Athlon64 X2 4200+ 2.20GHz	2x nVidia GeForce 7950 GT 512MB SLI
Ertan	Windows 7 64-bit	AMD A8-3500M 1.50GHz	AMD Radeon IGP 6620G
Surface 1-2	Windows 8.1 64-bit	Intel Core i5-3317U 2.53GHz	Intel HD Graphics 4000 1720MB (shared)

Instructions

Download https://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-aurora/firefox-40.0a2.en-US.win32.installer.exe
Run installer and select customize
Put the install in a known directory (C:\Aurora for purposes of this example)
Do NOT allow it to launch Firefox at the end of the install

Open C:\Aurora\defaults\pref\channel-prefs.js in a text editor
Change the line reading pref("app.update.channel", "release"); to pref("app.update.channel", "foobar");
Save and Close the text file

Run cmd.exe
Change directory to the folder where you installed Firefox: cd C:\Aurora
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"

Menu button > Options > General > Enable E10S (multi-process) should be checked
If not, check the box and restart Firefox

Play one of the game demos for 15 minutes, keeping an eye out for visual/audible/control issues and crashes.
Retest the demo with e10s disabled
Retest the demo in Chrome
file bug reports for issues that only reproduce in Firefox with e10s on
be sure you're retesting from scratch (assets are cached on first run)