Examine source code of PPRotator

{
  "manifest_version": 2,
  "name": "PPRotator",
  "version": "1.0",
  "description": "Enables 3D Rotation section of Privateer Press gallery without the need for Flash",
  "icons": {
    "48": "icons/pprotator.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://privateerpress.com/*/gallery/*"
      ],
      "js": [
        "pprotator.js"
      ]
    }
  ]
}