Compared to Chrome where you just get a row of indistinguishable minute tabs with no visible text? You can configure the min/max tab width in Firefox's preferences to control when it will start scrolling.
It will still start scrolling though. I'm happy with just the favicons, the one extra letter or two don't help really. Never had problem with 100+ tabs when I was using Opera. With firefox it was always a fight to set it up.
There is the “⌵” icon on the right side of the tabs that pulls down a list of open tabs.
I find this more useful than the ever shrinking tabs on Chrome. I have a hard time find a tab in Chrome once the number of tabs gets large.
And I still hate the "many tab handling" in ff where it makes me scroll.