Examine source code of vtt2gpt

{
  "manifest_version": 2,
  "name": "vtt2gpt",
  "version": "1.0.1",
  "description": "Extracts video VTT subtitles and sends them to ChatGPT",
  "author": "Ramon Dev <ramon.devx@proton.me>",
  "homepage_url": "https://github.com/rdev0x1/vtt2gpt",
  "browser_specific_settings": {
    "gecko": {
      "id": "vtt2gpt@rdev0x1.github.io",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage",
    "*://chat.openai.com/*",
    "*://chatgpt.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://chat.openai.com/*",
        "https://chatgpt.com/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "inject_composer.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "vtt2gpt",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  }
}