merge mozilla-central to mozilla-inbound. r=merge a=merge on a CLOSED TREE

accessible/tests/browser/.eslintrc.js

browser/app/profile/firefox.js

browser/base/content/aboutDialog-appUpdater.js

browser/base/content/browser-ctrlTab.js

browser/base/content/browser.xul

browser/base/content/tabbrowser.xml

browser/base/content/test/general/browser_bug423833.js

browser/base/content/test/general/browser_bug432599.js

browser/base/content/test/general/browser_bug521216.js

browser/base/content/test/general/browser_bug555767.js

browser/base/content/test/general/browser_bug585785.js

browser/base/content/test/general/browser_bug609700.js

browser/base/content/test/general/browser_printpreview.js

browser/base/content/test/general/browser_zbug569342.js

browser/base/content/test/urlbar/browser_bug304198.js

browser/components/customizableui/content/panelUI.inc.xul

.../customizableui/test/browser_1087303_button_fullscreen.js

...customizableui/test/browser_1087303_button_preferences.js

...i/test/browser_885052_customize_mode_observers_disabed.js

...bleui/test/browser_940307_panel_click_closure_handling.js