I just have a suggestion, if you could make tab transferring easier.
For example when you have 2 browser opens and you want to take 1 tab and drag it to another one.
It should also shut down first browser if it becomes completely empty(no need for operas tab, you already have it on another browser).
It is clunky at the moment and not satisfying like on the other browser and in my opinion it is the only minor minus of otherwise excellent browser.
Thank you for all your hard work and I hope you will continue doing it.