Examine source code of Remove Crunchyroll Dub

{
  "manifest_version": 2,
  "name": "Remove Crunchyroll Dub",
  "version": "1.0",
  "description": "Removes the dubbed episodes in the simulcastscalendar",
  "content_scripts": [
    {
      "matches": [
        "*://*.crunchyroll.com/*"
      ],
      "js": [
        "hide_dub.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{079e620a-3bdd-4221-872a-2f9efeb4105b}"
    }
  }
}