diff --git a/src/gtk3/applications/_firefox.scss b/src/gtk3/applications/_firefox.scss
new file mode 100644
--- /dev/null
+++ b/src/gtk3/applications/_firefox.scss
@@ -0,0 +1,14 @@
+// FIXME: Whenever Mozilla decides to fix their GTK stuff
+// and adds :backdrop stuff for this, fix the colors so that
+// we don't have to use this meh-looking color hack.
+// See: BMO#1562507
+#MozillaGtkWidget  {
+    headerbar, headerbar.titlebar {
+        color: gtk("@theme_titlebar_foreground");
+        background-color: gtk("@theme_titlebar_background");
+    }
+    menubar, .menubar {
+        color: gtk("@theme_titlebar_foreground");
+        background-color: gtk("@theme_titlebar_background");
+    }
+}
\ No newline at end of file
diff --git a/src/gtk3/gtk.scss b/src/gtk3/gtk.scss
--- a/src/gtk3/gtk.scss
+++ b/src/gtk3/gtk.scss
@@ -34,4 +34,5 @@
 @import "widgets/treeview";
 @import "widgets/window_decorations";
 
+@import "applications/firefox";
 @import "applications/chromium";
\ No newline at end of file