Examine source code of Spotehfi

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{BE525706-6CF7-11EA-A7B3-1426FC2CA371}",
      "strict_min_version": "74.0"
    }
  },
  "manifest_version": 2,
  "name": "Spotehfi",
  "description": "Detect and automatically open Spotify URL's in the Desktop App.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "version": "1.0.0",
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "https://open.spotify.com/"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}