Examine source code of Antifa

{
  "manifest_version": 2,
  "name": "Antifa",
  "version": "1.1",
  "description": "Replaces facebook feed with positive image to help maintain your inner peace",
  "icons": {
    "48": "icons/ico.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "antifa.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "conent.jpg",
    "icons/ico.jpg"
  ]
}