Examine source code of Tab Wheel Scroll

{
  "manifest_version": 3,
  "name": "Tab Wheel Scroll",
  "version": "3.1.0",
  "description": "Switch tabs with Alt + mouse wheel or right-click + mouse wheel.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tabwheelscroll@jonathanplantey",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "action": {
    "default_icon": {
      "16": "images/icon16.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "author": "Jonathan Plantey",
  "background": {
    "scripts": [
      "js/service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "scripting",
    "storage"
  ]
}