Bug 996364 - Calling CustomizableUI.registerArea a second time for the same area throws an exception. r=Gijs a=gavin
Bug 996899 - Calling CustomizableUI.registerArea with an altered 'legacy', 'overflowable', or 'type' should throw. r=mconley a=bkerensa

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rename : browser/components/customizableui/test/browser_996364_defaultCollapsed.js => browser/components/customizableui/test/browser_996364_registerArea_different_properties.js
Bug 996121 - Bouncing unicorn easter egg (in hamburger menu) briefly triggers scrollbar each time it hits the bottom of its bounce area when the font-size is not 12px. r=mconley a=bkerensa
Bug 997825 - fix the broken unicorn in RTL mode, r=jaws a=bkerensa