buvanenko

:root {	
	--bg: #00000066;
	--tabpanel-background-color: #00000000 !important;
	--in-content-page-background: #00000000 !important;
	--in-content-box-background: #00000088 !important;
	--tabs-navbar-separator-color: rgba(0, 0, 0, 0) !important;
}

tab.tabbrowser-tab[selected="true"] stack.tab-stack vbox.tab-background {
	background: #FFFFFF28 !important;

morrolinux

What to expect

Graphical aspect may vary depending on your choices in following the instructions below, but the end result should look something like this:

Enable Firefox features

ExecThTs

Originally written for mbnuqw/sidebery, a sidebar tab list extension. Requires a custom userChrome.css to be set up.

The following css will collapse and expand the sidebar when the mouse is hovered (or not):

/*transition_sidebar.css*/

#sidebar {
  transition: width 128ms ease !important;
 transition-delay: 128ms !important;