Best add on ever for Firefox

If the autohide/autoexpand functionality worked while the sidebar is hidden this would have the exact functionality I want. It wouldn't hurt to have an easier way to theme the appearance, either.

Absolutely fantastic! Short of making an espresso each morning, it's absolutely SUPERB AND FANTASTIC!!! Tree structure!!! Tabs panels!!! Wheel scrolling! Containers management!

My life has been drastically improved, thanks!!! :) :) :)

Pretty good alternative to Vivaldi's tab stacking feature. Make sure to turn on "Hide folded tabs" and it works like a charm.

this extension totally changed my browsing experience into full productivity. thanks a lot to the author and its contributors.

I don't just use sidebery for firefox, I use firefox because it has sidebery