Unreadable interface names in Firefox >= 42 tooltips

[rbrito]

Unfortunately, when Firefox is compiled with GTK3 support (as, say, Firefox 42), the tooltips that it creates are totally unreadable with the current version of the theme (I'm using Mediterranean Night).

I will try to provide a screenshot soon.

If anybody (@robertpainsi, @darvelo, @Dvad, anyone else?) has a fix for this issue, please send a pull request.

Thanks.

[soltysh]

I'm not an expert in css, but after following mods I'm getting nice black and most importantly readable tooltips: (although this is for MediterraneanWhiteNight, I'm pretty sure it can be applied to others as well)

$ git df
diff --git a/MediterraneanWhiteNight/gtk-3.0/gtk-widgets.css b/MediterraneanWhiteNight/gtk-3.0/gtk-widgets.css
index 317fe34..1af5218 100644
--- a/MediterraneanWhiteNight/gtk-3.0/gtk-widgets.css
+++ b/MediterraneanWhiteNight/gtk-3.0/gtk-widgets.css
@@ -157,12 +157,12 @@ GtkLabel:insensitive {
     border-style:              solid;
        border-radius: 4px;
        border-color:           alpha(@theme_tooltip_bg_color, 0.95);
-    background-color:  alpha(@theme_tooltip_bg_color, 0.85);
+    background-color:  @theme_tooltip_bg_color;
     color:                             shade(@theme_tooltip_fg_color, 0.90);
 }

 .tooltip * {
-    background-color: alpha(@theme_tooltip_bg_color, 0.0);
+    background-color: @theme_tooltip_bg_color;
 }