* Firefox tooltip fix. (#422)

gtk-3.20/scss/widgets/_misc.scss

@@ -15,6 +15,7 @@
 ************/
 
 @include exports("tooltip") {
+    .tooltip, // Firefox fix
     tooltip {
         &.background {
             &, &.csd {
@@ -22,11 +23,10 @@
                 background-clip: padding-box;
                 border: 1px solid border_normal($tooltip_bg_color);
                 border-radius: $roundness;
+                color: $tooltip_fg_color;
             }
         }
 
-        label { color: $tooltip_fg_color; }
-
         * {
             background-color: transparent;
             color: inherit;