Examine source code of Send to Json Dispatch

{
  "manifest_version": 2,
  "name": "Send to Json Dispatch",
  "description": "Send to jsondispatch json-rpc api",
  "version": "0.2resigned1",
  "homepage_url": "https://github.com/ibizaman/jsondispatch",
  "developer": {
    "name": "Pierre Penninckx"
  },
  "background": {
    "scripts": [
      "util.js",
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs",
    "storage",
    "notifications"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb670bdd-bc7f-40a8-af1c-630e89c5d9fb}"
    }
  }
}