Examine source code of Knockout Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Knockout Blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(28, 27, 34)",
      "toolbar_text": "rgb(204, 204, 204)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(204, 204, 204)",
      "toolbar_field": "rgb(15, 15, 15)",
      "toolbar_field_text": "rgb(196, 212, 236)",
      "tab_line": "rgb(6, 107, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(204, 204, 204)",
      "tab_loading": "rgb(6, 107, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{998ae779-25f3-4437-ae52-096188daa6f6}"
    }
  }
}