fx115: Fix menubar text colour and window control buttons on Linux

Window control buttons are a regression in c8d49e76

scss/components/_titleBar.scss

@@ -64,6 +64,7 @@
 
 #titlebar {
 	display: flex;
+	flex-direction: row;
 	justify-content: center;
 	-moz-window-dragging: drag;
 	menu {

scss/linux/_titleBar.scss

@@ -27,6 +27,11 @@
 	height: var(--tab-min-height);
 	appearance: none;
 	flex: 1;
+	color: CaptionText;
+}
+
+#toolbar-menubar:-moz-window-inactive {
+	color: InactiveCaptionText;
 }
 
 #menubar-items {
@@ -60,9 +65,6 @@
  * window state. Otherwise, elements in the navigator-toolbox, like the menubar,
  * can swallow those events. */
 .titlebar-buttonbox {
-	right: 0px;
-	position: absolute;
-	height: var(--tab-min-height);
 	z-index: 1;
 	display: flex;
 	align-items: center;