Examine source code of Quick Notes

{
  "manifest_version": 2,
  "name": "Quick Notes (Local)",
  "version": "1.0.0",
  "description": "Save short notes locally from the toolbar. Notes are stored only in the browser and never sent to external servers.",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_title": "Quick Notes",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "foolsetlover_quicknotes@example.com",
      "strict_min_version": "68.0"
    }
  }
}