Examine source code of Heavy Recent Tab Switcher

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "heavy-duty-tab-switcher@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "name": "Heavy Duty Tab Switcher",
  "version": "1.0.1",
  "description": "An ultra-fast, premium keyboard-driven tab switcher for heavy-duty multitasking. Grid visualization, instant Alt+Q cycling, Alt+W search, and middle-click closing.",
  "icons": {
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "alarms",
    "contextualIdentities"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Heavy Duty Tab Switcher",
    "default_icon": {
      "32": "icon-32.png",
      "48": "icon-48.png",
      "64": "icon-64.png",
      "96": "icon-96.png",
      "128": "icon-128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Q"
      }
    },
    "open-pinned-tabs": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Open pinned-tab quick switcher"
    }
  }
}