Examine source code of BMW - Broken Mouse Wheel

{
  "manifest_version": 2,
  "name": "BMW - Broken Mouse Wheel",
  "version": "0.0.3resigned1",
  "description": "Just hold the CTRL button while moving your mouse to scroll up and down",
  "icons": {
    "48": "icons/mouse-48.png",
    "94": "icons/mouse-94.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "bmw.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcae1609-85b5-4d82-a9f0-e33e13e49539}"
    }
  }
}