Examine source code of Dark Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(19, 24, 42)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(19, 24, 42)",
      "tab_background_text": "rgb(205, 205, 205)",
      "toolbar_field": "rgb(19, 24, 42)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(19, 24, 42)",
      "popup_text": "rgb(215, 226, 239)",
      "popup_border": "rgba(34, 25, 77, 0)",
      "popup_highlight": "rgba(255, 255, 255, 0.15)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0)",
      "toolbar_field_focus": "rgb(15, 12, 27)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab588024-632d-4f74-9976-12a96d1841ca}"
    }
  }
}