Examine source code of searchBarShortcut

{
  "manifest_version": 2,
  "name": "searchBarShortcut",
  "author": "Michael Berryman",
  "description": "Mozilla Firefox Web Extension to add a shortcut to move focus to the current page's search bar. If there's currently any text highlighted, then that will be added to the search bar. ",
  "version": "1.1resigned1",
  "homepage_url": "https://github.com/MichaelBerryman/searchBarShortcut",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdb10d05-9277-48dd-afc3-e01eca7fbcce}"
    }
  }
}