2 files changed, 7 insertions, 4 deletions
diff --git a/devtools/client/shared/components/menu/MenuButton.js b/devtools/client/shared/components/menu/MenuButton.js
index 3367987c3c..4a3b1e5c48 100644
--- a/devtools/client/shared/components/menu/MenuButton.js
+++ b/devtools/client/shared/components/menu/MenuButton.js
@@ -427,9 +427,12 @@ class MenuButton extends PureComponent {
       buttonProps.className = buttonProps.className
         ? `${buttonProps.className} ${iconClass}`
         : iconClass;
-      buttonProps.style = {
-        "--menuitem-icon-image": "url(" + this.props.icon + ")",
-      };
+      // `icon` may be a boolean and the icon URL will be set in CSS.
+      if (typeof this.props.icon == "string") {
+        buttonProps.style = {
+          "--menuitem-icon-image": "url(" + this.props.icon + ")",
+        };
+      }
     }
 
     if (this.state.isMenuInitialized) {
diff --git a/devtools/client/shared/components/menu/MenuList.js b/devtools/client/shared/components/menu/MenuList.js
index 4c355cca10..dafcc407bc 100644
--- a/devtools/client/shared/components/menu/MenuList.js
+++ b/devtools/client/shared/components/menu/MenuList.js
@@ -55,7 +55,7 @@ class MenuList extends PureComponent {
     this.notifyHighlightedChildChange(e.target.id);
   }
 
-  onMouseOutOrBlur(e) {
+  onMouseOutOrBlur() {
     const hoveredElem = this.wrapperRef.querySelector(":hover");
     if (!hoveredElem) {
       this.notifyHighlightedChildChange(null);