What actual browser innovation looks like
I'm not sure if this will be the right UI choice for me, but I can see a lot of people liking it.
Kudos to Mozilla for seeing browsers as both mature technology as well as still being capable of significant improvement.
Another interface choice will help some get far more work done than yet another buzzy AI "feature."
Especially since most websites *still* haven't caught up with widescreen monitors.
I wish I I had this feature for some of my work yesterday and today. I have an online spreadsheet open in one tab, as I copy and paste out of another tab (or window) involving frequent tabbing and switching. In a multi-monitor setup, that's not a problem. It becomes a real bear when doing it on one laptop, even though mine has enough screen real estate to accommodate both side by side (which is what I've been doing).
This split makes it much easier to resize, needing only one tool action, rather than two.
I also wonder how users who hadn't thought of this before will now say "bloody good idea" and find their time much better spent.
If only we could get more people on Firefox. Chrome's near-monoculture is not healthy for an open web. Remember the days of Internet Exploder?