Firefox: CSS not loading when redirecting to the server-side portal

[Tzal3x]

What happened?

On firefox, when being redirected from the sw portal to the server-side portal, the CSS of the temporary (spinning) screen is not loaded.

See the following recording:
https://github.com/user-attachments/assets/b5a6821c-13a3-4517-b9fd-e4d13a086bae

Upon writing this issue, the problem did not occur in other browsers.

Search terms

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Steps to reproduce

1. Change the the if ("serviceWorker" in navigator) clause to always return false here in order to simulate an environment where a service worker is not installable.
2. Open a firefox private tab
3. Run cd portal/worker && pnpm run serve
4. Try to access a walrus site using the local portal (e.g. http://docs.localhost:8080)

Deviation steps

No response

Relevant log output

No response

Version

• walrus and site-builder are up to date.

If applicable, what browsers are you seeing the problem on?

Firefox

Code of Conduct

• I agree to follow this project's Code of Conduct.