Ctrl+Tab doesn't work on Mac like other more popular or well-known browsers on any OS... Having a basic often-used feature go against the grain is a disconcerting choice that has caused me to switch back to Brave and Chrome.
What do you mean by this? If you mean ctrl-tab switching to tabs in most recent used order, there is an option for that now. It's actually on by default in new profiles in Firefox. The previous behavior (in order switching) was left for existing profiles, to avoid disruption.