Remix App Deployment Domain *.fly.dev not loading

Hi,
for some reason my dev-domain is not loading the app. This was working some days ago with another app. Today i created a new app. I followed the readme from Remix Blues-Stack.

https://github.com/remix-run/blues-stack

The app was successfully deployed. Staging and Production.

But if i want to open the url [my-project].fly.dev the browser does nothing… its loading… and loading… and loading.

EDIT:
I tried to open the url in an incognito tab: Its loading as expected.
But not in the main browser window. Why?

What should i do? Is this a browser cache problem?

Thanks for helping me :kissing_closed_eyes:

Restarting the browser was working.
I leave this Post here. Maybe somebody faces the same problem.