Examine source code of Pipi

{
  "manifest_version": 2,
  "name": "Pipi",
  "version": "1.0",
  "description": "Replaces all images in the browser with a peepee",
  "icons": {
    "48": "icons/pipi-48.png",
    "96": "icons/pipi-96.png"
  },
  "web_accessible_resources": [
    "images/*.png"
  ],
  "applications": {
    "gecko": {
      "id": "sefergusson138@gmail.com",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "pipi.js"
      ]
    }
  ]
}