And it is even the #1 browser in places where Chrome can not be used (thanks to US export regulations) and in places where people think about security (Germany).
It doesn't. The point being made was that W3Schools browser usage closely correlates to HN browser usage, which I think isn't accurate. W3Schools isn't that great of a resource, and I presume that the average HN reader's expertise is such that they wouldn't rely on a resource like W3Schools.
Even worse, I've become accustomed specifically to vertical 'tree-style' tabs. I hate that I need them - it makes me less flexible than I would want to be.
The simple fact it is a separate window bothers me. I know you can't change the Chrome UI without using C++ but the Firefox version looks and works much better.
Until Chrome lets people modify the browser UI like Tree Style Tab and other addons do, I won't be interested in switching. It's a good browser for my parents, computer labs, etc. but I could never use it on my workstation.
The other simpler addon is not a separate window, but this one is much better once you get used to it. Worth it as it really takes things to a different level.
BTW you can move the tab outliner itself to a tab and close the window.
If you haven't used it before, and if you're prone to having 10+ tabs open at a time, I highly recommend it. Although I warn you that you may never wish to use Safari or Chrome again...
Chrome used to have a similar feature built-in but they removed it ages ago.