Examine source code of CrispyDubRemover

{
  "manifest_version": 2,
  "name": "CrispyDubRemover",
  "version": "1.0",
  "description": "Easily remove dubbed shows from Crunchyroll's simulcast calendar, helping you find running shows faster.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.crunchyroll.com/simulcastcalendar"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icon.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7591a51-5742-4063-bd69-09a223a37478}"
    }
  }
}