Bug 867161 - Update the Composer style on OSX r=mconley, f=richard.marti, ui-r=richard.marti, a=jcranmer
Bug 906264 - Update the Linux Composer UI r+ui-r=Paenglab, a=jcranmer
Bug 960672 - Windows - Update Composer UI. r+ui-r=me, a=jcranmer