Examine source code of Bookmark Toolbar Shortcuts

{
  "manifest_version": 2,
  "name": "Bookmark Toolbar Shortcuts",
  "developer": {
    "name": "Haggai Nuchi",
    "url": "https://haggainuchi.com"
  },
  "version": "1.0.1",
  "description": "Use Alt+# for bookmarks in the toolbar",
  "permissions": [
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "bookmark.js"
    ]
  },
  "commands": {
    "bookmark-shortcut-1": {
      "description": "Go to bookmark number 1",
      "suggested_key": {
        "default": "Alt+1"
      }
    },
    "bookmark-shortcut-2": {
      "description": "Go to bookmark number 2",
      "suggested_key": {
        "default": "Alt+2"
      }
    },
    "bookmark-shortcut-3": {
      "description": "Go to bookmark number 3",
      "suggested_key": {
        "default": "Alt+3"
      }
    },
    "bookmark-shortcut-4": {
      "description": "Go to bookmark number 4",
      "suggested_key": {
        "default": "Alt+4"
      }
    },
    "bookmark-shortcut-5": {
      "description": "Go to bookmark number 5",
      "suggested_key": {
        "default": "Alt+5"
      }
    },
    "bookmark-shortcut-6": {
      "description": "Go to bookmark number 6",
      "suggested_key": {
        "default": "Alt+6"
      }
    },
    "bookmark-shortcut-7": {
      "description": "Go to bookmark number 7",
      "suggested_key": {
        "default": "Alt+7"
      }
    },
    "bookmark-shortcut-8": {
      "description": "Go to bookmark number 8",
      "suggested_key": {
        "default": "Alt+8"
      }
    },
    "bookmark-shortcut-9": {
      "description": "Go to bookmark number 9",
      "suggested_key": {
        "default": "Alt+9"
      }
    }
  }
}