[andreas_g]

Originally Posted by Handycam

I don't know, these thumbnails still seem pretty useful even with a lot of tabs open:

ok, i agree, that there go more than 10, maybe about 20 to 25 horizontal tabs into one browser window, if you size it the whole screen width. A lot more than i initially thougt, so "tab capacity" seems not to be a problem for most of the people.
But expanding the width of a browser window to the whole screen width is going to produce much free (white) space on right an left of most web pages, or make lines of text unreadable long.

I still believe, that horizontal tabs cause a massive loss of usable space in the browser window, even on the whole screen.
They just don't fit for the common format of web pages, as most of them are relatively narrow but often very long.

Vertical tabs need to stay, at least as an option!