Examine source code of DOM Tracker

{
  "manifest_version": 2,
  "name": "DOM Tracker",
  "author": "robert mietusch",
  "version": "0.1",
  "description": "Tracks and Exports DOM Changes.",
  "icons": {
    "48": "assets/icon-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "tracker.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "DOM Tracker",
    "default_icon": "assets/icon-48.png",
    "default_popup": "popup.html"
  }
}