Examine source code of Superuser_v1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Superuser",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(66, 85, 99)",
      "toolbar_text": "rgb(128, 224, 167)",
      "frame": "rgb(37, 42, 54)",
      "tab_background_text": "rgb(106, 225, 154)",
      "toolbar_field": "rgb(37, 42, 54)",
      "toolbar_field_text": "rgb(128, 224, 167)",
      "tab_line": "rgb(128, 224, 167)",
      "popup": "rgb(66, 85, 99)",
      "popup_text": "rgb(128, 224, 167)",
      "tab_loading": "rgb(128, 224, 167)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa22a30a-988d-42ca-beb6-32b9bce3dce9}"
    }
  }
}