The prospect of Firefox surviving?
The prospect of a non-Chrome browser having significant enough sway in defining interoperable web standards to steer much of web tech away, not towards, ad-industry-driven tech like Topics et al.
The status quo is never something to wish for
Also, Firefox still supports the original Mozilla concept of multiple profiles (which probably even comes from Netscape 4) which is more or less the same thing as Chromium profiles. IIRC the command line options involved in that are same, except last time I cared about that (~2017) Chromium did not have an GUI profile selection/management dialog
Oh no, nevermind, the company wants to virtue signal and shmooz. Carry on.
I know this is different from tab groups, but it's something I don't think exists in Chrome, at least not as a Google-maintained extension. I've encountered some really awful 3rd party Chrome extensions.
That has never actually happened (yet). Though it is true that firefox offers APIs for better blocking.