Awesome plugin. Using it for years.
Also faced issue with signed one "Internet connection issue" Not able to update.

This was excellent, but today has suddenly disappeared and I can't re-download it. I get 'Download failed. Check your internet connection'. Please fix it! It's so much better to have my tabs at the side....But then, while writing this, it has suddenly reappeared!!! Thank you for this app. :)

Unable to download 3.0.11...

Wonderful that this extension is back!
I request for a quick tab search similar to how other sidebar tab extensions are now providing. That will make this a perfect extension.
Also if you could have hiding the close button as an option somewhere that will be nice.

Seems when i restart firefox the connection to the parent tab is dropped, so structure end up flat again. A bit annoying, and looses a big part of its function. Otherwise a nice addon with potential.

must have

It's wonderful to work with tabs in a tree in the sidebar. However, there's a frequent bug appearing: sometimes the last tab or the one before the last one bring you to the incorrect tab (and reloading the extension/sidebar doesn't work). Other times it won't let you change tabs at all (clicking, ctrl+tab works fine), or hang unexpectedly until you reload it. It's not reliable, but when it works is quite useful.

only reason why i am using firefox

Seems to work great and doesnt ask for ridiculous permissions. I appreciate that.

One request i have though. Could it be made into a popout like tabsoutlier on chrome?