Examine source code of easyHebrewKeyboard

{
  "description": "Makes it so you don't need to switch keyboards for Duolingo Hebrew!",
  "manifest_version": 2,
  "name": "easyHebrewKeyboard",
  "version": "1.4resigned1",
  "homepage_url": "http://www.hg8i.com/easyHebrewKeyboard",
  "icons": {
    "48": "icons/border-48.png"
  },
  "applications": {
    "gecko": {
      "id": "easyHebrewKeyboard@hg8i.com",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.duolingo.com/*"
      ],
      "js": [
        "jquery.js",
        "easyHebrewKeyboard.js"
      ]
    }
  ]
}