This might be Apple's bug in their productbrowser.js.
Brief summary:
- They are detecting whether CSS animation is available (Fx4: false, Fx5: true)
- If unavailable, degraded code is used (<div id="pb-mac"> has pb-degraded)
- If available, CSS transform translate3d() is used, which Gecko doesn't implemented yet
This might be Apple's bug in their productbrowser.js.
Brief summary:
- They are detecting whether CSS animation is available (Fx4: false, Fx5: true)
- If unavailable, degraded code is used (<div id="pb-mac"> has pb-degraded)
- If available, CSS transform translate3d() is used, which Gecko doesn't implemented yet