I also noticed that I can reproduce the issue pretty consistently if this forum is the first page I load after killing Firefox and clearing the cache, whereas it usually works if I load some other page first and only then open the forum.
Interesting. I don’t have the feeling that I saw the same correlation so far. When it happened I repeatedly killed Firefox and opened that page first until it worked. But I had just as much trouble when I had been browsing other pages in other tabs before.
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Probably this is not related, but can anybody open https://www.vmt-thueringen.de/ and try to pick a date and time for routing information? Doesn’t work for me on Firefox mobile, the calendar is strangely ordered, so I can’t confirm the date. Chrome seems to be working
Just to follow up: I have seen this happen plenty of times on Version 117 by now. So it does not seem to be fixed and is just luck.
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No difficulty finding a train from Plaue to Erfurt Hbf next Wednesday morning 
Firefox 116.3 on FP4.SP2K.B.089
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@OldRoutard
you really should update your Firefox, 117.1.0 fixes a critical zero-day: Security Vulnerability fixed in Firefox 117.0.1, Firefox ESR 115.2.1, Firefox ESR 102.15.1, Thunderbird 102.15.1, and Thunderbird 115.2.2 — Mozilla
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Thanks for testing. Maybe it is caused by uBlock origin 
I already tried disabling all that. It’s also not FP4 specific. The FP5 has it too and I could also reproduce it on my Pixel 3 for quite some time.
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I have missed this topic so far, but I have the same problem every now and then (it usually helps to force close FF and then try again). Will head over to bugzilla later.
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