bug 852805. Add an event handler to the "find in page" textbox to make 'enter' equivalent to 'find next'. r=ally
bug 851936 allow uninstall of builtin providers, r=markh
Bug 857580 - Fix breakpoint trampoline to store a NULL stub pointer. r=djvj
Bug 579517 - Remove some PRBools. r=ehsan
Bug 857335 - Add EventDispatcher warnings about events with no listeners. r=mfinkle r=kats
Bug 822810 - Enable low precision rendering in more scenarios. r=kats

This patch matches previous behaviour, but adds the following scenarios:
- When rendering is aborted due to the viewport falling out of the displayport,
  enable low precision rendering.
- When the viewport falls out of the displayport during low precision rendering,
  low precision rendering will be enabled on the next frame.