It used to be that the left/right scroll arrows would scroll the visible tabs one whole tab at a time. This made it very predictable when you were about to reach the far right of the open tabs. Now, however, when you click the right scroll arrow, depending on how many tabs are open, it might shift over to the right just a fraction of a tab. There might be more tabs hidden to the right, but you can't tell when you're approaching the last one, so if you keep clicking the right scroll arrow repeatedly, you might accidentally scroll to the end when the right scroll arrow disappears, and then your next click opens a new unwanted tab. Very frustrating.
Please bring back the behavior of scrolling by a whole tab at a time. I don't see any benefit to scrolling by fractional tabs.