Examine source code of Crossover Extension

{
  "manifest_version": 2,
  "name": "Crossover Extension",
  "version": "1.1",
  "description": "Connects to WorkSmart for URL tracking",
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": []
    }
  ],
  "background": {
    "scripts": [
      "track.js"
    ]
  },
  "options_ui": {
    "page": "background-page.html",
    "browser_style": true
  }
}