Examine source code of TabCloack

{
  "manifest_version": 2,
  "name": "TabCloack",
  "version": "1.0.0",
  "description": "Lock, disguise, and password-protect your browser tabs. Tabs close automatically if the extension is disabled.",
  "author": "Deepak",
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "TabCloak – Tab Locker",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "commands": {
    "panic-lock": {
      "suggested_key": {
        "default": "Ctrl+Alt+L",
        "mac": "MacCtrl+Shift+L"
      },
      "description": "Panic: instantly re-lock all locked tabs and switch away"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabcloak@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}