Examine source code of One Tab Focus

{
  "manifest_version": 2,
  "name": "One Tab",
  "version": "2.0",
  "description": "One tab. Full focus. Click the icon to toggle.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "lamine.abdellaoui@proton.me",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "One Tab"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  }
}