Examine source code of NoTabNotif

{
  "name": "NoTabNotif",
  "version": "0.2.1",
  "manifest_version": 2,
  "description": "Removes the notification counter in tab titles.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/rsc/imgs/NoTab-TitleNotif-16.png",
      "32": "/rsc/imgs/NoTab-TitleNotif-32.png",
      "48": "/rsc/imgs/NoTab-TitleNotif-48.png",
      "128": "/rsc/imgs/NoTab-TitleNotif-128.png"
    }
  },
  "icons": {
    "16": "/rsc/imgs/NoTab-TitleNotif-16.png",
    "32": "/rsc/imgs/NoTab-TitleNotif-32.png",
    "48": "/rsc/imgs/NoTab-TitleNotif-48.png",
    "128": "/rsc/imgs/NoTab-TitleNotif-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "anantstrange@protonmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}