Examine source code of Quick Tab Switcher

{
  "manifest_version": 2,
  "name": "Quick Tab Switcher",
  "version": "1.0",
  "description": "Switch tabs quickly using a popup with keyboard search.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-tab-switcher": {
      "suggested_key": {
        "default": "Ctrl+Shift+K"
      },
      "description": "Open tab switcher popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-tab-switcher@example.com",
      "strict_min_version": "91.0"
    }
  }
}