Examine source code of Clean Feed for Facebook™

{
  "manifest_version": 2,
  "name": "Clean Facebook",
  "version": "1.4resigned1",
  "description": "Makes Facebook's homepage uncluttered",
  "icons": {
    "48": "icons/eraser.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "cleaner.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ccca6988-a9b2-4de0-815e-489a3773cc25}"
    }
  }
}