I have been using Opera for more than 15 years and I really love it.
I was trying to compare two different websites and it was difficult to switch between the two tabs to compare.
I think if there was an option that the user could select two or more tabs at the same time to compare the different information and they could scroll together or separately, Opera would show its advantage to the competitors once more .

Hope to see this capability in the future version.

Regards,
Mohsen