Wow. This thing is seriously awesome. Why this is not how ALL browers are by default is baffling.

Edit: And it turns out to be better at navigating and managing bookmarks better than the actual bookmark manager.

What the smeg ?! It opens the bookmarks sidebar !? How hideous is that ! I was expecting the tabs to cascade from their default position, you know, as actual tabs ! This is mental ! Useless.

This is the only way that I use firefox now. I've even edited my chrome to hide the top tabs. Honestly I cannot say enough nice things about this extension and I am thankful it exists.

I've been using this extension for years and years. It's probably the main reason I stay on Firefox, it's that good. It means I can eaily manage many tabs with ease.