Rated 1 out of 5 stars

This addon seems like a fork of Vertical Tabs (https://addons.mozilla.org/en-US/firefox/addon/vertical-tabs/), with a new style.

"Vertial Tabs" has some annoying bugs. These bugs still exist in this add-on, to name a few:
- Does not restore tab settings after disabling the addon
- When set tabs to show at right side, should not change bookmark/history sidebar to right side.
- App tabs have wrong position

Besides, this addon brings some problems which doesn't exist in vertical tabs:
- Not showing buttons in tab bar - not able to access these buttons.
- Style do not respect system font/size settings, especially annoying for non-english characters.