Examine source code of LeetRooms

{
  "manifest_version": 3,
  "name": "LeetRooms",
  "version": "0.1.0",
  "description": "Multiplayer rooms for LeetCode.",
  "homepage_url": "https://leetrooms.com",
  "action": {
    "default_icon": {
      "16": "icons/16.png",
      "24": "icons/24.png",
      "32": "icons/32.png"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{987cc249-f89d-4643-8391-d7ed1d205624}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/problems/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}