As of Feb 24th, this crashes for me (Milan) on Windows.  Can anybody else run it?
rhunt - Bug 1346107 - fixed

To enable add these to your prefs:
user_pref("layers.force-active", true);
user_pref("layers.advanced.border-layers", true);
user_pref("layers.advanced.text-layers", true);
user_pref("layers.advanced.bullet-layers", true);
user_pref("layers.advanced.caret-layers", true);
user_pref("layers.advanced.boxshadow-outer-layers", true);
user_pref("layers.advanced.boxshadow-inset-layers", true);
user_pref("layers.advanced.outline-layers", true);
user_pref("layers.advanced.displaybuttonborder-layers", true);

Display Items needing translation to WebRender

• XULImage (subrects)
• Background (gradients and images) (rhunt)
• BackgroundColor (force-active)
• Border - Ethan / morris I think? bug 1337681. Need border image
• BoxShadowInner (mchang)
• CanvasBackgroundColor (force-active)
• Mask
• nsDisplaySVGGeometry
• Opacity
• SolidColor (jnicol, bug 1339575)
• Text - lsalzman
• ThemedBackground (mozilla.widget.disable-native-theme=true)

Issues with known causes

• Premultiplied Alpha (https://github.com/servo/webrender/issues/889) fixed in upstream webrender
• Some colors go wrong in the chrome
• Left and right edges of a tab look bad
• Text layers on linux - lsalzman
• WRImageLayer Transforms (https://bugzilla.mozilla.org/show_bug.cgi?id=1332688) fixed
• Some images are not scaled down correctly (rust icon on home page)
• No border on top of moused-over non-current tab

Issues

• Hovering over items in about:tab causes a transform glitch
• Back button has no border (when border layers are enabled)