Examine source code of Tap Closer

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.1.1",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "notifications"
  ],
  "background": {
    "scripts": [
      "src/background/index.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "src/popup/index.html",
    "default_icon": {
      "16": "assets/icons/icon.svg",
      "32": "assets/icons/icon.svg",
      "48": "assets/icons/icon.svg",
      "128": "assets/icons/icon.svg"
    }
  },
  "icons": {
    "16": "assets/icons/icon.svg",
    "32": "assets/icons/icon.svg",
    "48": "assets/icons/icon.svg",
    "128": "assets/icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabs-closer@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}