#allow add search engine
  browser.urlbar.update2.engineAliasRefresh
  
  browser.urlbar.trimURLs
  
  full-screen-api.transition-duration.leave 0 0
  full-screen-api.transition-duration.enter 0 0
  
  #enable loading indicator from hourglass to animation
  ui.prefersReducedMotion 0
  
  #enable compact mode
  browser.compactmode.show true