Thank you very much for implementing fast Colorful Tabs for Firefox version 57 (Quantum).
Just to report a few problems with the implementation (under Windows 10 version 1709, do not know about other operation systems):
1. Title bar disappeared, together with the standard small icons: Move/Size/etc. Firefox icon in the left corner, and minimize (_), maximize (square), close (x) icons in the right corner.
2. Without the title bar, it is impossible to move open window around the screen.
3. All tabs except the current one are black.
4. Also black is the two areas: to the left of the tabs with the '<' icon to move farther to the left tabs, and to the right of the tabs with the icons '>', '+', and 'arrow down". The icons still work, but it is impossible to see them on the black background.
5. The menu bar above tabs also became black. Fortunately, the menu items still are visible (as dark gray), but barely. It may create problems for people with bad vision.
Hope the information will be useful.
