diff --git a/platform/firefox/css/legacy-toolbar-button.css b/platform/firefox/css/legacy-toolbar-button.css
index 37900cb30..b6489d555 100644
--- a/platform/firefox/css/legacy-toolbar-button.css
+++ b/platform/firefox/css/legacy-toolbar-button.css
@@ -1,8 +1,8 @@
 #uBlock0-legacy-button {
-    list-style-image: url('../img/browsericons/icon-large.svg');
+    list-style-image: url('../img/browsericons/icon24.svg');
 }
 #uBlock0-legacy-button.off {
-    list-style-image: url('../img/browsericons/icon-large-off.svg');
+    list-style-image: url('../img/browsericons/icon24-off.svg');
 }
 
 toolbar[iconsize="small"] #uBlock0-legacy-button {
@@ -30,7 +30,7 @@ toolbar[iconsize="small"] #uBlock0-legacy-button.off {
 
 /* Override off state when in palette */
 toolbarpaletteitem #uBlock0-legacy-button.off {
-    list-style-image: url('../img/browsericons/icon-large.svg');
+    list-style-image: url('../img/browsericons/icon24.svg');
 }
 
 /* Override badge when in palette */
diff --git a/platform/firefox/img/browsericons/icon-large-off.svg b/platform/firefox/img/browsericons/icon24-off.svg
similarity index 100%
rename from platform/firefox/img/browsericons/icon-large-off.svg
rename to platform/firefox/img/browsericons/icon24-off.svg
diff --git a/platform/firefox/img/browsericons/icon-large.svg b/platform/firefox/img/browsericons/icon24.svg
similarity index 100%
rename from platform/firefox/img/browsericons/icon-large.svg
rename to platform/firefox/img/browsericons/icon24.svg