Ux 2013 01 25 cherry picked

* [Bug 833039](https://bugzilla.mozilla.org/show_bug.cgi?id=833039) - AppGrid Font Size
* [Bug 826386](https://bugzilla.mozilla.org/show_bug.cgi?id=826386) - [Email] Account list height fixing
* [Bug 830903](https://bugzilla.mozilla.org/show_bug.cgi?id=830903) - OS Doesn't properly use privacy_sprite.png in Settings
* [Bug 818832](https://bugzilla.mozilla.org/show_bug.cgi?id=818832) - Change color and height of step indicator