FireFox/Stylish: Adjustments for the Add-on "Tree Style Tabbar" and its "sidebar" skin

tree_style_tabbar_adjust.css

/*
    Adjustments for the Add-on "Tree Style Tabbar" and its "sidebar" skin
    
    Made for (and with) FireFox 15b thru 31b (Australis)
    
    @author FichteFoll
*/

@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

/* Correcting background color
 * Seems like it has been included by default */
#TabsToolbar:not(:-moz-lwtheme).treestyletab-tabbar-toolbar[treestyletab-style="sidebar"] {
    background-color: #DBEAF9 !important;
}

/* Remove background color for the <tabs> thingy - same as above */
/*#TabsToolbar:not(:-moz-lwtheme).treestyletab-tabbar-toolbar
.tabbrowser-tabs {
    background: none transparent !important;
}*/

/* Fix padding in Australis */
#TabsToolbar:not(:-moz-lwtheme).treestyletab-tabbar-toolbar[treestyletab-style="sidebar"]
.tabbrowser-tab {
    padding-left: 2px !important;
    padding-right: 0 !important;
}

/* TODO: Attempt to change the color of the gray border on the tabbar's right;
   apparently I have no idea where this is comming from so I can't override it */
/*.treestyletab-tabbar-toolbar[treestyletab-style="sidebar"] {
    border-right: 0px solid #BAC7D4 !important;
}*/

/* Hover colors on tabs */
:root[treestyletab-enable-compatibility-tmp="true"] /* some wierd "hacks for Tab Mix Plus" override my definitions with this, so I need it too */
.treestyletab-tabbar-toolbar[treestyletab-style="sidebar"]
#tabbrowser-tabs[treestyletab-style][treestyletab-mode="vertical"]
.tabbrowser-tab:not([selected="true"])/*:not([pinned="true"])*/:hover {
    background: -moz-linear-gradient(center top, hsla(0, 0%, 90%, 1), hsla(0, 0%, 80%, 1)) repeat-x scroll 0 0 transparent !important;
    border-top: 1px solid hsla(0, 0%, 80%, 1) !important;
}

Is it still working?
I tried it in Stylish, but not work