Examine source code of Tab Limit

{
  "manifest_version": 3,
  "name": "Tab Limit",
  "version": "1.0",
  "permissions": [
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "tabLimit.js"
    ]
  },
  "icons": {
    "16": "placeholder.png",
    "32": "placeholder.png",
    "64": "placeholder.png",
    "128": "placeholder.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "placeholder.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "buzzoff@actnatural.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  }
}