Examine source code of Muvic Sync Helper

{
  "manifest_version": 3,
  "name": "Muvic Sync Helper",
  "short_name": "Muvic",
  "version": "0.1.5",
  "description": "Sync your Spotify playlists to Beatport and Bandcamp from muvic.app. Handles logins so you stay signed in on your own browser.",
  "author": "Muvic LLC",
  "homepage_url": "https://muvic.app",
  "browser_specific_settings": {
    "gecko": {
      "id": "sync-helper@muvic.app",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Muvic Sync Helper",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "cookies",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://*.beatport.com/*",
    "https://*.bandcamp.com/*",
    "https://muvic.app/*",
    "https://dev.muvic.app/*",
    "http://localhost:3000/*",
    "http://localhost:3001/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://muvic.app/*",
        "https://dev.muvic.app/*",
        "http://localhost:3000/*",
        "http://localhost:3001/*"
      ],
      "js": [
        "bridges/page-bridge.js"
      ],
      "run_at": "document_start"
    }
  ]
}