Examine source code of OT_Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "OT_Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(23, 23, 23)",
      "toolbar_text": "rgb(31, 165, 204)",
      "frame": "rgb(32, 32, 36)",
      "tab_background_text": "rgb(41, 139, 215)",
      "toolbar_field": "rgb(32, 32, 36)",
      "toolbar_field_text": "rgb(220, 230, 255)",
      "tab_line": "rgb(63, 87, 239)",
      "popup": "rgb(32, 32, 36)",
      "popup_text": "rgb(63, 87, 239)",
      "tab_loading": "rgb(63, 87, 239)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a9c9af4b-f8f3-4f98-989c-f751ae4d9876}"
    }
  }
}