Hide additional icons

chrome/userChrome.css

@@ -1,4 +1,4 @@
-/* Remove fullscreen transition animation */
+/* Remove fullscreen transition */
 #navigator-toolbox[fullscreenShouldAnimate] { transition: none !important; }
 
 /* Enable page action button */
@@ -17,6 +17,18 @@
 /* Set User Scripts icon to grayscale */
 #appMenu-popup #appMenu-multiView #appMenu-userChromeJS-button .toolbarbutton-icon { filter: contrast(10) grayscale(1) invert(); }
 
+/* Set Firefox View icon to grayscale */
+#TabsToolbar #firefox-view-button { filter: grayscale(1); }
+
+/* Set private browsing icon to grayscale */
+#private-browsing-indicator-with-label > image.private-browsing-indicator-icon { filter: grayscale(1) invert(); }
+
+/* Hide private browsing label */
+#private-browsing-indicator-with-label > label { display: none; }
+
+/* Hide tab bar spacer */
+#TabsToolbar .titlebar-spacer[type="post-tabs"] { display: none; }
+
 /* Hide reader view button when not active */
 #urlbar #page-action-buttons #reader-mode-button:not([readeractive="true"]) { display: none; }
 
@@ -34,7 +46,7 @@
 
 /* Shrink bookmark separators */
 #PlacesToolbarItems > toolbarseparator::before {
-	filter: opacity(0.3) !important;
+	filter: opacity(0.3);
 	height: 80%;
 	margin: auto;
 }