Examine source code of Poggers

{
  "manifest_version": 2,
  "name": "Poggers",
  "version": "2.0",
  "description": "Changes every image to a picture of the pogchamp.",
  "icons": {
    "48": "icons/pogchamp48.png",
    "96": "icons/pogchamp96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "poggers.js"
      ]
    }
  ]
}