"that" isn't referring to the line about firefox, because firefox was used as an example of doing it right. "that" referred to the first line:
> I can't use Chrome once my tabs shrink down to this: |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Chrome tabs don't shrink down to a row of lines anymore.
The current behavior is still annoying but it fits a lot more tabs before breaking and it breaks much less severely.