I like to use tabs and I usually have lots of tabs open. After getting used to Tree Style Tab [1], using any browser without vertical tab arrangement (in trees)

I like to use tabs and I usually have lots of tabs open. After getting used to Tree Style Tab [1], using any browser without vertical tab arrangement (in trees) is a PITA. There actually was a crippled vertical tabs feature (named "side tabs") in Chrome, but the developers eventually removed it [2]. One of the best things with Firefox for me is that it allows for these more low level changes of browser behavior and UI. [1] https://addons.mozilla.org/sv-se/firefox/addon/tree-style-tab/ https://addons.mozilla.org/sv-se/firefox/addon/tree-style-ta... [2] http://www.techerator.com/2011/11/a-fond-farewell-to-vertical-tabs-in-google-chrome/ http://www.techerator.com/2011/11/a-fond-farewell-to-vertica...