Examine source code of Sorenson Internet Dial

{
  "name": "Sorenson Internet Dial",
  "version": "1.0.21",
  "description": "Allows ntouch users to dial videophone calls by clicking on the phone numbers listed on Internet pages displayed in the Firefox browser.",
  "permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lodash.js",
        "zepto.js",
        "contentscript.js"
      ]
    }
  ],
  "icons": {
    "16": "sorenson-16.png",
    "48": "sorenson-48.png",
    "128": "sorenson-128.png"
  },
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "jid1-zIxyPxyA0bdTGg@jetpack"
    }
  }
}