{
  "dom.mouseevent.which.enabled": false,
  "dom.mozbrowser.enabled": false,
  "layout.columns.enabled": false,
  "layout.column-width.enabled": false,
  "layout.column-count.enabled": false,
  "layout.column-gap.enabled": false,
  "layout.flex.enabled": false,
  "layout.flex-direction.enabled": false,
  "layout.text-orientation.enabled": false,
  "layout.viewport.enabled": false,
  "layout.writing-mode.enabled": false,
  "shell.homepage": "http://doc.servo.org/servo/index.html"
}

{
  "dom.mouseevent.which.enabled": false,
  "dom.mozbrowser.enabled": false,
  "layout.columns.enabled": false,
  "layout.column-width.enabled": false,
  "layout.column-count.enabled": false,
  "layout.column-gap.enabled": false,
  "layout.flex.enabled": false,
  "layout.flex-direction.enabled": false,
  "layout.text-orientation.enabled": false,
  "layout.viewport.enabled": false,
  "layout.writing-mode.enabled": false,
  "shell.homepage": "http://servo.org"
}

Change default homepage to servo.org
Change default homepage to servo.org
