Let us rejoice as mail will be back soon and the opera we loved too, thanks to John von Tetzchner's new browser vivaldi, currently available as tech preview on linux, windows and osx: https://vivaldi.com/

Suddenly hope again.

good news! the sidebar is back, tab stacking is back, and much more to come.

Opera is back, from John von Tetzchner himself except it is now called vivaldi and is currently available as tech preview on win, osx and linux: https://vivaldi.com/