Examine source code of Gptium

{
  "manifest_version": 2,
  "name": "Gptium",
  "version": "1.3",
  "description": "Send selected text to ChatGPT",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "16": "assets/icon16.png",
      "48": "assets/icon48.png",
      "128": "assets/icon128.png"
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "homepage_url": "https://github.com/crnobog69/gptium",
  "author": "Црнобог | Crnobog",
  "browser_specific_settings": {
    "gecko": {
      "id": "{10ed2d3d-016e-4909-b055-cf5d62ecbdd6}"
    }
  }
}