For some reason, I'm softlocked from booking tickets from Deutsche Bahn. The website errors out with a cryptic "Your browser's behavior resembles that of a bot." message with no option to try again or pass a captcha or whatever. The website itself described several possible solutions but none helped (I tried using different computers, different internet connections, even a phone connected to internet using a SIM from a different country).
As for now, when I need to travel to Germany, I just book tickets through the national carrier of my home country, which for cross-border tickets often turns out to actually be cheaper than booking through DB. Thankfully I don't live in Germany proper and my need for travel there is not that high (once or twice a year at most) but I wonder what would I do if I had to move to Germany and use trains there more often.
Same problem but with French equivalent SNCF (sncf-connect.com). I just checked and can confirm nothing has changed. You cannot use up-to-date Firefox on Linux to access the main booking site for French rail tickets.