Opera (as usual) had this ability for years, although I have not used recent versions of their browser, so dunno if it's still there. They also added a nice "ta

Opera (as usual) had this ability for years, although I have not used recent versions of their browser, so dunno if it's still there. They also added a nice "tab group" feature, which was/is much better than firefox's half-assed tab group feature (which isn't even "visible" by default because it sucks). EDIT: Can find older versions to check it out here (Appears as 12.17 is the last version which had this): http://www.opera.com/download/guide/?os=windows&list=all http://www.opera.com/download/guide/?os=windows&list=all. You simply right click the tab bar and it has place> top/left/right/bottom. I use Firefox now, and couldn't survive without Tree style tabs, although I still miss a significant number of features from Opera, although from what I gather, they basically thrown away most of it and now have not much more than a clone of Chrome. This is baffling to me too - current Opera is a clear regression from what they had 5 years ago.