Examine source code of Cloud Clipper

{
  "manifest_version": 2,
  "name": "Cloud Clipper",
  "version": "0.1.2",
  "description": "Clip any web page to Markdown and save directly to Google Drive",
  "browser_specific_settings": {
    "gecko": {
      "id": "cloudclipper@foliomd.app",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "identity",
    "https://www.googleapis.com/*",
    "https://accounts.google.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "Readability.js",
        "turndown.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  }
}