Basically it says the browser is unsupported, I cannot track down exactly which change causes this as disabling all forms of protection in the new tab doesn't change a thing. Please make changes that break known popular sites more easily accessible, this can push away people from gnu because "making my stuff work is a drag", copy pasting on facebook for example doesn't work without enabling clipboardevents in the about:config)
-- http://gnuzilla.gnu.org
