>How about just not have 400 tabs open? Because it allows me to access 400 tabs worth of information at a glance.

I am not "gatekeeping," I just think that you aren't using the "power" of the browser if you have <10 tabs open and limited tab name space. What's your definition of browser "power user?"

On my MBP, I have 10 windows (each with a title representing general category). In each, I have: up to 24 pinned tabs that take up three tab slots up to 30 regular tabs open that I can see without scrolling each of my tabs has 40 characters of name space, which is plenty to know exactly what the tab is

I'm sorry if my post came off as acerbic. I will admit that I am annoyed as hell that:

1. Chrome has such market share when it doesn't have a descent vertical tab solution

2. Safari's vertical tabs are a total joke and Brave's are barely better

3. Firefox doesn't have native vertical tabs so I have to rely on an extension and they make it a total pain to get rid of the horizontal tabs

Point 3 is why I don't use vertical tabs on Firefox. While I don't think that vertical tabs is a necessary feature, facilitating modifications to the UI via addons would be a huge win for anyone who wants to implement such features, or even experiment with different forms of user interaction.