[erlich]

Checked out Tabs Outliner a few years back. Too complex for me. But it feels like once you get the hang of it, it might be useful if you fear losing those golden tab gems.

IMHO you always come across more tabs than you ever have a chance to read. And you'll always get back to them again when you actually need them via Google search.

I would love a tab sidebar. This might make Firefox worth checking out.