Examine source code of Fact Spreader

{
  "manifest_version": 3,
  "name": "Fact Spreader",
  "version": "4.0.5",
  "description": "Fact-check any text or image on the web using AI. Supports DeepSeek, Kimi, ChatGPT, Claude & local LLMs. Privacy-first.",
  "permissions": [
    "storage",
    "activeTab",
    "clipboardWrite",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "favicon-16.png",
      "48": "favicon-48.png",
      "128": "favicon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "favicon-16.png",
    "48": "favicon-48.png",
    "128": "favicon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fact-check-extension@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    }
  }
}