I've been using this for a few years now and it's excellent, thank you Croydon! There are only two things I would change about it if I could. One is the ability to have custom spacing between tabs. I'd also like to be able to get rid of the top panel that says "Vertical Tabs Reloaded". It just wastes screen space and has no purpose to me, if I want to change sidebars I always use keyboard shortcuts. I also find the small "VTR" icon annoying. It doesn't tie in with the elegant look of Firefox and actually reminds me of an unloaded graphic. It would be better just to have a simple icon like the "synced tabs" icon.