Examine source code of LeadDesk

{
  "manifest_version": 2,
  "name": "Leaddesk plugin",
  "version": "1.30resigned1",
  "default_locale": "en_US",
  "description": "A plugin for recognizing phone numbers for Leaddesk.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "author": "Codemate",
  "background": {
    "scripts": [
      "js/prefManager.js",
      "js/background.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "leaddesk@codemate.com",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "css": [
        "css/callManagerPro.css"
      ],
      "js": [
        "libs/jquery.js",
        "js/callManagerPro.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": {
      "19": "icons/bar_icon19.png",
      "38": "icons/bar_icon38.png"
    }
  },
  "options_ui": {
    "page": "html/options.html"
  },
  "offline_enabled": false,
  "permissions": [
    "tabs",
    "http://login-1.leaddesk.com/buttons/patterns/patterns.xml",
    "https://login-1.leaddesk.com/",
    "http://support.leaddesk.com/"
  ]
}