--- a/devtools/client/inspector/inspector.js
+++ b/devtools/client/inspector/inspector.js
@@ -1366,16 +1366,21 @@ Inspector.prototype = {
     this._openMenu({
       screenX: e.screenX,
       screenY: e.screenY,
       target: e.target,
     });
   },
 
   _openMenu: function({ target, screenX = 0, screenY = 0 } = { }) {
+    if (this.selection.isSlotted()) {
+      // Slotted elements should not show any context menu.
+      return null;
+    }
+
     let markupContainer = this.markup.getContainer(this.selection.nodeFront);
 
     this.contextMenuTarget = target;
     this.nodeMenuTriggerInfo = markupContainer &&
       markupContainer.editor.getInfoAtNode(target);
 
     let isSelectionElement = this.selection.isElementNode() &&
                              !this.selection.isPseudoElementNode();