Examine source code of Bookmark Bar Switcher

{
  "name": "Bookmark Bar Switcher",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "1.0.0",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmark-bar-switcher@yaiol.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "action": {
    "default_icon": {
      "16": "assets/app-16.png",
      "32": "assets/app-32.png",
      "48": "assets/app-48.png",
      "128": "assets/app-128.png"
    },
    "default_popup": "popup/index.html",
    "default_title": "Bookmark Bar Switcher"
  },
  "background": {
    "scripts": [
      "background/main.js"
    ]
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "assets/app-16.png",
    "32": "assets/app-32.png",
    "48": "assets/app-48.png",
    "128": "assets/app-128.png"
  },
  "commands": {
    "next-bar": {
      "suggested_key": {
        "default": "Ctrl+Down"
      },
      "description": "__MSG_cmdNextBar__"
    },
    "previous-bar": {
      "suggested_key": {
        "default": "Ctrl+Up"
      },
      "description": "__MSG_cmdPreviousBar__"
    },
    "switch-to-1": {
      "suggested_key": {
        "default": "Ctrl+Shift+1"
      },
      "description": "__MSG_cmdSwitchTo1__"
    },
    "switch-to-2": {
      "suggested_key": {
        "default": "Ctrl+Shift+2"
      },
      "description": "__MSG_cmdSwitchTo2__"
    },
    "switch-to-3": {
      "description": "__MSG_cmdSwitchTo3__"
    },
    "switch-to-4": {
      "description": "__MSG_cmdSwitchTo4__"
    },
    "switch-to-5": {
      "description": "__MSG_cmdSwitchTo5__"
    },
    "switch-to-6": {
      "description": "__MSG_cmdSwitchTo6__"
    },
    "switch-to-7": {
      "description": "__MSG_cmdSwitchTo7__"
    },
    "switch-to-8": {
      "description": "__MSG_cmdSwitchTo8__"
    },
    "switch-to-9": {
      "description": "__MSG_cmdSwitchTo9__"
    },
    "switch-to-10": {
      "description": "__MSG_cmdSwitchTo10__"
    }
  }
}