Examine source code of Office 365 Blue

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Office 365 Blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(248, 248, 250)",
      "toolbar_text": "rgb(81, 81, 90)",
      "frame": "rgb(25, 108, 201)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(70, 70, 70)",
      "tab_line": "rgb(248, 248, 250)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(248, 248, 250)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e266bb57-aedd-4656-beda-2024dcb76727}"
    }
  }
}