I really like the sidebar, and I think vertical tabs are amazing, even though really new.
I want to make a lot of extensions like "side view" that open a website as a sidebar popup, for example a dictionary. This would be really useful.
But currently the vertical tabs are in the same sidebar, so a sidebar popup will be next to the sidebar, which is not ergonomic as it squeezes the main website to the very left. See this image:
Instead, 2 options would suffice for this:
1. Allow h...