Examine source code of Etarget Plugin

{
  "manifest_version": 2,
  "name": "Etarget Plugin M2",
  "description": "This extension will promote Facebook posts",
  "version": "1.1",
  "page_action": {
    "default_icon": {
      "16": "/img/icon_16.png",
      "48": "/img/icon_48.png",
      "128": "/img/icon_128.png"
    },
    "default_title": "Etarget Plugin"
  },
  "icons": {
    "16": "/img/icon_16.png",
    "48": "/img/icon_48.png",
    "128": "/img/icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{db621c9d-488a-4166-ad3d-53243ab76c0d}"
    }
  }
}