Earlier quoted context omitted.
Firefox out of the box indeed does not cause broken websites. However, the demographic of this forum probably will use Firefox with "Multi-Account Containers", "Temporary Containers", "uBlock Origin", and a few more. These are amazing for privacy and productivity, but will occasionally cause broken websites. Source: I am a Firefox-first user who occasionally uses plugin-less Chrome because the aforementioned plugins…
> Source: I am a Firefox-first user who occasionally uses plugin-less Chrome because the aforementioned plugins (and "ClearURLs", "Consent-o-matic", and a few others) occasionally break websites. I have good luck just using a private window, since that has no extensions by default. Bonus: It's really fast; ctrl-l ctrl-c ctrl-shift-p ctrl-c enter
FTFY
EDIT: Mine was wrong too. Thanks to ipython for the correction.