Examine source code of AtBlock

{
  "name": "AtBlock",
  "description": "Removes @ (at) from the YouTube Live Chat and improves tagged visibility",
  "version": "1.0.0",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "atblock@ponkhy",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "img/logo-16.png",
    "32": "img/logo-34.png",
    "48": "img/logo-48.png",
    "128": "img/logo-128.png"
  },
  "action": {
    "default_icon": "img/logo-48.png"
  },
  "content_scripts": [
    {
      "js": [
        "assets/chunk-B2r4f4KG.js"
      ],
      "matches": [
        "*://*.youtube.com/*",
        "*://youtube.com/*",
        "*://*.youtu.be/*",
        "*://youtu.be/*"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "img/logo-16.png",
        "img/logo-34.png",
        "img/logo-48.png",
        "img/logo-128.png"
      ]
    },
    {
      "matches": [
        "*://*.youtu.be/*",
        "*://*.youtube.com/*",
        "*://youtu.be/*",
        "*://youtube.com/*"
      ],
      "resources": [
        "assets/chunk-B2r4f4KG.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}