In the intro paragraph, the example given for the plugin manifest is invalid. The valid value for “allowedDomains” is o"none"], not "none". Additionally, "devAllowedDomains" cannot be set to "none" as validation complains that “none” is not a valid url.

{

  "name": "MyPlugin",

  "id": "737805260747778092",

  "api": "1.0.0",

  "main": "code.js",

  "ui": "ui.html",

  "documentAccess": "dynamic-page",

  "networkAccess": {

    "allowedDomains": "none",

    "devAllowedDomains": "none"

  }

}