Examine source code of Slim Facebook

{
  "manifest_version": 2,
  "name": "Slim Facebook",
  "version": "1.1",
  "description": "Removes stories, rooms and sponsored posts from your Facebook feed.",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/"
      ],
      "js": [
        "slimFacebook.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f71ba79b-bce4-41c9-8a54-dfb0307fc327}"
    }
  }
}