Examine source code of Avmenisextension

{
  "manifest_version": 2,
  "name": "Avmenisextension",
  "version": "1.2",
  "description": "Replace all image with Avmenise",
  "icons": {
    "48": "avmenise.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}