Free wifi captive portal not opening in Firefox

When accessing free e.g. company wifi networks (sometimes badly managed), I find that 1) Ubuntu is very robust and always manages to open the portal in Firefox 2) Debian is not as good but mostly works too 3) EndeavourOS only works with very few.

Any ideas as to why? And what to do when no portal opens in Firefox? Thanks.

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Looks like this https://www.reddit.com/r/wifi/comments/czp77a/hotel_wifi_login_page_wont_load/ should work. It probably happens as I have portmaster in EnOS and not the others :wink: