Decent styling utility. Unfortunately, it doesn't work as expected with vertical tabs. The background image/pattern option doesn't apply to it as it would with horizontal tabs.

Super, sauf quand on veut importer un ancien thème dedans pour l'éditer : c'est tout simplement impossible, il faut se retaper l'ensemble des choix un par un.

Exported themes cannot be used in Firefox. Attempting to import them produces an error message.

Export function outdated, won't work for Addons Marketplace

The .xpi file still uses manifest v2, which is no longer accepted. This causes errors like “incomplete theme”. Mozilla hasn't updated this export feature even though v3 has been required for a while.

There are some problems:

- It can't change context menu color.
- Exported themes can't be installed, Firefox says it is broken.

A workaround for sidebar text contrast issues when using dark theme.
:root {
color-scheme: light dark !important;
}