I am using Opera ver 70.0.3728.133. I have enabled the smooth scrolling flag and also installed the Logitech Smooth Scrolling extension from the Chrome Web Store. It just doesn't work. but in both Chrome and Edge smooth scrolling works a dream. I've tried lots of workarounds, enabling /disabling, etc. and also installed (and then uninstalled) the smooth scrolling extension available in Opera Addons ... but nothing works. Shame, as I like the browser and it would have been my default browser but I just can't use it with such choppy, jumpy scrolling. Any ideas?