Natural scrolling vertical tabs
I use "natural scrolling" on my Mac i.e. scrolling up on my mouse-wheel makes the page go down. I have vertical tabs on the right hand side of my Vivaldi window. Scrolling these (either when the mouse is over the tab bar or using Right Click & Scroll) doesn't obey the natural scrolling convention. So I need to get over muscle memory just for this one case. Note that scrolling in a web page obeys natural scrolling - it's just the tab bar that doesn't.