Genial!!! por años usando esta extención en todos los navegadores. OJO. pero te pide instalar aplicaciones en tu windows de seguridad si no se instala te bloquea la navegación...

nothing happens when i press the button, it doesn't open (it works in chrome)

https://docs.microsoft.com/ja-jp/windows/security/threat-protection/microsoft-defender-application-guard/md-app-guard-browser-extension
↑Microsoft公式ではしっかり最新版もサポートされていると書いてありますが、このアドオン自体のアップデートが2020年8月13日以降来ていないのが少々気になります。

link hijacker and spyware to track your web usage in firefox and then hijack firefox links into ms edge, use sandboxie

This extension needs to tell the user exactly what URL was opened in WDAG.

amazing

It's just another way for Microsoft to move you to Edge. No, really, this is the extent of this "integration": some pages will open in Edge instead of Firefox, depending on the site policies.