Examine source code of JOHN - Light Gray

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "JOHN - Light Gray Ver.2",
  "theme": {
    "images": {},
    "properties": {
      "color_scheme": "dark",
      "content_color_scheme": "auto"
    },
    "colors": {
      "toolbar": "rgb(127, 141, 148)",
      "toolbar_text": "rgb(24, 2, 8)",
      "frame": "rgb(74, 83, 88)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(223, 234, 241)",
      "toolbar_field_text": "rgb(2, 4, 26)",
      "tab_line": "rgb(47, 41, 42)",
      "popup": "rgb(220, 220, 246)",
      "popup_text": "rgb(8, 19, 253)",
      "tab_loading": "rgb(47, 41, 42)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1635d183-26fc-4352-bbb9-a2ab87c2e809}"
    }
  }
}