Best argument from the article imo:

It’s a simple matter of screen real estate. Virtually every modern computer display is widescreen, which is to say it’s wider than it is tall. Websites and web apps, meanwhile, are practically always vertical experiences. Whether you’re on a 13-inch laptop or a 32-inch behemoth of a monitor, the space from top to bottom of your computer is more precious than the space from left to right.

No, thanks. They look fucking ugly.

Disagree, as one who uses the tiling system having different windows in a 2x2 grid or half + 2x1 grid. While vertical real estate is more valuable than horizontal for reading, vertical browser tabs would cramp the horizontal space too much, and having the browser in the top half just dont work well exactly because of the value of vertical space.

Meh.

I have been using vertical tabs for a long time, through Tree Style Tab (Firefox Extension), which has the additional benefit of tree hierarchy.

I don't see a "everyone should use them", though. People have different usage patterns, number of tabs, amount of parallel or queued work and concerns, or ability to clear out tabs on session end. Many people prefer classic horizontal tabs - whether as a deliberate decision or not.

I certainly prefer horizontal tabs, and by a lot. But I don't think it's the best layout for everyone and every usage pattern. It's good that we have the choice of alternatives.

Idk man I just prefer having tab titles visible for quicker navigation. If I'm actually doing some long form reading, full screen is one key press away

No. They're a waste of space.

Fuck you!

But yes, you are right

Maybe this is an attempt in killing browsers designed specifically for this kind of layout like Zen browser and Arc. Firefox had this for a long time also.