Examine source code of Green Black Simple

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green Black Simple",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(14, 15, 14)",
      "toolbar_text": "rgb(109, 141, 117)",
      "frame": "rgb(14, 15, 14)",
      "tab_background_text": "rgb(109, 141, 117)",
      "toolbar_field": "rgb(36, 46, 37)",
      "toolbar_field_text": "rgb(109, 141, 117)",
      "tab_line": "rgb(109, 141, 117)",
      "popup": "rgb(14, 15, 14)",
      "popup_text": "rgb(109, 141, 117)",
      "button_background_hover": "rgb(36, 46, 37)",
      "tab_text": "rgb(109, 141, 117)",
      "toolbar_top_separator": "rgb(109, 141, 117)",
      "toolbar_vertical_separator": "rgb(109, 141, 117)",
      "tab_loading": "rgb(109, 141, 117)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7a8d025-05db-4b9c-a29e-9f10b6776dce}"
    }
  }
}