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manifest.json

{
  "manifest_version": 2,
  "name": "Re-open Closed Tab with Cmd + Z",
  "version": "1.1",
  "description": "Reopens the last closed tab if Cmd + Z is pressed and the focus is outside an input field.",
  "permissions": [
    "activeTab",
    "tabs",
    "sessions"
  ],
  "icons": {
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png",
    "512": "icons/icon-512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "commands": {
    "reopen_last_tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+T",
        "mac": "Command+Shift+T"
      },
      "description": "Reopen the last closed tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{752a4c7b-4fa5-44ca-a10d-8d86a0dc4c0b}"
    }
  }
}