diff --git a/userChrome.css b/userChrome.css
index 88499e3..1783d75 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -277,7 +277,7 @@
   #appMenu-proton-update-banner::before,
   .subviewbutton > image {
     -moz-context-properties: fill;
-    fill: var(--toolbarbutton-icon-fill);
+    fill: currentColor;
     fill-opacity: var(--toolbarbutton-icon-fill-opacity);
   }