For saving vertical space, my favorite thing about Firefox is Treestyle Tabs. I edited the CSS to make the font size a bit bigger, but make the padding so small

For saving vertical space, my favorite thing about Firefox is Treestyle Tabs. I edited the CSS to make the font size a bit bigger, but make the padding so small it's slightly negative even (it would be horrible to read text like that, but for tabs it kinda works). Now I can fit ~40 tabs vertically on the screen easily, with very readable tab titles, and I can expand the sidebar at will if I want to see the full length of titles for some reason, or use F1 to toggle it on and off. Not that this takes away from your point.. but frankly, as long as the browser UI can be customized, the default setup will never matter to me. If this appeals more to non-technical people, more power to them, as long as I can have my power user stuff, too.