Examine source code of Pittys PhysikUnblocker

{
  "manifest_version": 2,
  "name": "Pittys PhysikUnblocker",
  "version": "1.0",
  "description": "Unblocks the PayToView-Solutions on physikaufgaben.de",
  "icons": {
    "48": "icon_48.png",
    "96": "icon_96.png",
    "256": "icon_256.png",
    "512": "icon_512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.physikaufgaben.de/*"
      ],
      "js": [
        "unblock.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f849b81-586d-4ac8-a65a-50d090f9bb2b}"
    }
  }
}