Examine source code of Shopping List Extractor

{
  "manifest_version": 2,
  "name": "Shopping List Extractor",
  "version": "1.0",
  "description": "Extracts shopping lists from web pages and displays them for easy copying.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Extract Shopping List"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b1c24b9-ffa1-4c52-8087-1413becd9712}"
    }
  }
}