Examine source code of orangeHub

{
  "name": "orangeHub",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "212121.png"
    },
    "colors": {
      "frame": "rgba(33, 33, 33, 1)",
      "tab_background_text": "rgba(200, 200, 200, 1)",
      "toolbar": "rgba(33, 33, 33, 1)",
      "bookmark_text": "rgba(240, 240, 240, 1)",
      "toolbar_field": "rgba(33, 33, 33, 1)",
      "toolbar_field_text": "rgba(240, 240, 240, 1)",
      "tab_line": "rgba(255, 153, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe038513-e790-42fb-b6b2-1f6f931cb15b}"
    }
  }
}