Examine source code of Simple Text Summarizer

{
  "manifest_version": 2,
  "name": "Simple Text Summarizer",
  "version": "1.0",
  "description": "Summarize selected text using a basic algorithm.",
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f856f2e5-ebb7-4ba3-ad23-6e6ca8a1e28c}"
    }
  }
}