No VTR, no Firefox. Having my tabs neatly in a row to the right of my screen is a must for me. VTR does 95% of what a I consider essential for a vertical tabs manager to do. The missing 5 %? Ability to choose custom color for current/visited tab, and the means to customize the height of a tab. (I'd like to slim the down a couple of pixels. Will donate.

The only real option for functioning vertical tabs, as far as I can tell. Thank you very much for this addon!

this is great, vertical tabs should be the standard nowdays, still looking for pdf reader with vertical tabs

With the demise of tab groups, this is the only way to properly manage having many tabs (60+) opened at once

Great extension. Just what I need.

Small suggestions:
A search box for tabs would be nice. Custom CSS themes as well. Oh, and the icon is unfortunately black on dark grey when using a dark Firefox theme. Is it possible to fix that?

Excellent work.

Does its job very well. Some features I'd like (tab search and icon-only display for pinned tabs) are still not there but planned for 1.0.0.

I absolutely love this toolbar. Thank you so very much for making, sharing and allowing us to have it for free. Many, many blessings and thanks to you all.

Worked when first installed; does not show up at all now--not on reload, not on install, not after system reboot.
+++++
No way to reply to Croydon's suggestion. so I'm just editing my review.

None of those solutions worked until I resubmitted my review; then suddenly the icon to load the tabs worked. FF Quantum seems to have lots of bugs.

VTR makes Firefox worth running, I'd be lost without it.

Great extension. Can't wait for Mozilla to open up and allow the "lost features" to be restored!

This add-on is so good it should be standard for Firefox.

The version before the last Firefox update was PERFECT. However, the new version lacks many of the features it once had. I'm sure the developer is fixing this and look forward to updates!

Firefox should have this feature built in but a fantastic extension will do instead. Clearly in active development as it has survived the WebExtensions transition. Why would you have a 16:9 browser and have horizontal tabs?