Examine source code of PowerTabs - Tab Switcher

{
  "manifest_version": 3,
  "name": "PowerTabs - Tab Switcher",
  "version": "1.2.3",
  "description": "Quick tab switcher with keyboard shortcuts, search across tabs, recently closed tabs, history, and bookmarks",
  "author": "softwaremanufaktur.co",
  "homepage_url": "https://softwaremanufaktur.co",
  "developer": {
    "name": "softwaremanufaktur.co",
    "url": "https://softwaremanufaktur.co"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "powertabs@firefox.extension",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "scripting",
    "history",
    "bookmarks",
    "sessions"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "overlay.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "commands": {
    "toggle-overlay": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "Command+Shift+E"
      },
      "description": "Toggle PowerTabs overlay"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "overlay.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  }
}