Examine source code of Anti-Reflection Overlay

{
  "manifest_version": 2,
  "name": "Anti-Reflection Overlay",
  "version": "1.0.1",
  "description": "Reduce glare on bright images using a subtle overlay filter.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Toggle Anti-Reflection"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "anti-reflection-overlay@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects": false
      }
    }
  }
}