Examine source code of Hover Summary

{
  "manifest_version": 2,
  "name": "Hover Summary",
  "version": "1.0.1",
  "description": "Show an AI summary of a link by hovering it with your mouse.",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Hover Summary",
    "default_icon": {
      "48": "icons/icon48x48.png",
      "1024": "icons/icon.png"
    },
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "Readability.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{786fd87d-bc21-4f7c-8115-43b3e07eb521}"
    }
  }
}