Examine source code of Draft Room Extension

{
  "name": "Draft Room Extension",
  "description": "Draft Room Extension enriches your draft experience by pulling live updates of the selected players in your drafts.",
  "version": "1.0.1",
  "manifest_version": 3,
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://draft-room.com/*",
        "*://localhost/*"
      ],
      "js": [
        "draftRoomContentScript.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://underdogfantasy.com/*"
      ],
      "js": [
        "underdogContentScript.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": "draft_room_transparent.png",
    "default_title": "Draft Room"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "2dbfc3102be7f3e361946a9c07b7fc5c3f42ce0e@draft-room-extn"
    }
  }
}