Port bug 888510 - changes to plugin theming - to fix mozmill bustage. rs=jcranmer. Bustage fix for CLOSED TREE
Bug 889752 - Focus clicked menupopups in click_menus_in_sequence. r=Standard8. Part of work towards bustage fix for CLOSED TREE
Bug 871266 - wait for Customize sheet close in tests on OS X. r=Standard8. Part of work towards bustage fix for CLOSED TREE
Disable test_customize_toolbar_doesnt_double_get_mail_menu on Mac due to permanent orange, and now hitting bug 900499 which needs fixing separately. rs=jcranmer. Bustage fix for CLOSED TREE