What opera really needs in order for it to replace the big 3 on my computer (Safari, Chrome, and Firefox) is a way to recover all last closed tabs, like when you have to install Adobe Flash, then you have to restart the browser, but if I have a bunch of tabs that I need to keep open, I don't have any good way to recover them all at once like in the big 3 browsers. That makes me hate a browser if you can't do that. I often have to restart a computer or the browser and I need to be able to restore all open tabs