diff --git a/userChrome.css b/userChrome.css
index 382ea16..c4117c4 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -739,9 +739,17 @@
   #appMenu-proton-update-banner::before,
   #downloadsHistory .button-icon,
   .subviewbutton > image {
-    fill: currentColor;
-    fill-opacity: var(--toolbarbutton-icon-fill-opacity);
-    -moz-context-properties: fill stroke;
+    fill: currentColor !important;
+    fill-opacity: var(--toolbarbutton-icon-fill-opacity) !important;
+    -moz-context-properties: fill !important;
+  }
+  #appMenu-zoomReduce-button2 > .toolbarbutton-icon,
+  #appMenu-zoomEnlarge-button2 > .toolbarbutton-icon {
+    stroke: var(--zoom-controls-bgcolor, var(--button-bgcolor, ButtonFace)) !important;
+    -moz-context-properties: fill, stroke !important;
+  }
+  #appMenu-zoomReduce-button2:not([disabled], [open], :active):is(:hover) > .toolbarbutton-icon, #appMenu-zoomEnlarge-button2:not([disabled], [open], :active):is(:hover) > .toolbarbutton-icon {
+    stroke: var(--button-hover-bgcolor) !important;
   }
 
   .subviewbutton[disabled=true] > image {