Examine source code of Focus theme dark blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Focus theme dark blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(31, 34, 61)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(11, 11, 39)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 83, 0)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 83, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5a91cee-553f-4bbf-ac3d-18c102ea0e4d}"
    }
  }
}