Examine source code of VisTube

{
  "name": "VisTube",
  "description": "Allows you to focus on the video you are watching and not the other stuff YouTube wants you to focus on.",
  "version": "1.2",
  "manifest_version": 3,
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png",
    "256": "icons/256x256.png",
    "512": "icons/512x512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "vistube@sujal.dev"
    }
  }
}