@burnout426 oh no.... I just tested. Private browsing will work fine. What should we do?

ctrl + shift + v now is working, but I still can't see the right click menu of Google Spreadsheet. Anyone know why is this happening?

I recently switched from Google Chrome to Opera but I notice there's an disadvantage, Google Spreadsheet had stopped working properly anymore.
Example when I use Ctrl + shift + v it does nothing.
When I right click, instead of showing Google Spreadsheet own righ-click menu, Opera one is displayed instead.

Why is this happening? How to solve this?