I switched to sideberry a while back, and yeah - very much agreed, it's leagues ahead of others in terms of base experience breadth (container tabs and whatnot are fully integrated) and customization options.
Their wiki also has a very simple and effective userChrome.css tweak to hide the top tab bar when the side panel is open. That's a rather crucial vertical space savings on a small laptop.
Their wiki also has a very simple and effective userChrome.css tweak to hide the top tab bar when the side panel is open. That's a rather crucial vertical space savings on a small laptop.