Examine source code of HTTP Response Codes

{
  "manifest_version": 2,
  "name": "HTTP Response Codes",
  "version": "1.0",
  "description": "A sidebar reference for HTTP response status codes",
  "permissions": [],
  "sidebar_action": {
    "default_title": "HTTP Codes",
    "default_panel": "sidebar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f47bd10b-58bb-4398-b567-0e02b2c3d479}"
    }
  }
}