Examine source code of Printer for Gemini Chat

{
  "manifest_version": 3,
  "name": "Printer for Gemini Chat",
  "version": "1.3",
  "description": "Unofficial tool to cleanly format and print Google Gemini chat sessions. Supports LaTeX math rendering and removes UI clutter for paper or PDF export.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "print-gemini-session@zbjxb.gitee.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {}
  },
  "content_scripts": [
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Print Gemini Session"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' https: data:; font-src 'self' data:"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}