Examine source code of Dark Blure

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Blure",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(132, 132, 132)",
      "frame": "rgb(26, 26, 30)",
      "tab_background_text": "rgb(117, 117, 117)",
      "toolbar_field": "rgb(32, 31, 30)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(30, 17, 121)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(237, 237, 251)",
      "tab_loading": "rgb(30, 17, 121)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{583ef29c-88c6-4128-b4ad-9debae21048a}"
    }
  }
}