Examine source code of OpenIntoDNS

{
  "manifest_version": 2,
  "name": "OpenIntoDNS",
  "version": "2.0",
  "description": "Adds the ability to check a domain on IntoDNS by right-clicking on a link.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "intodnslink.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff8e1325-de46-44a6-ac06-3369accb2214}"
    }
  }
}