foo.diff

diff --git a/devtools/client/debugger/content/views/sources-view.js b/devtools/client/debugger/content/views/sources-view.js
index 365599f..7833789 100644
--- a/devtools/client/debugger/content/views/sources-view.js
+++ b/devtools/client/debugger/content/views/sources-view.js
@@ -684,11 +684,13 @@ SourcesView.prototype = Heritage.extend(WidgetMethods, {
 
     // Show the conditional expression panel. The popup arrow should be pointing
     // at the line number node in the breakpoint item view.
+    setTimeout(() => {
     this._cbPanel.hidden = false;
     this._cbPanel.openPopup(breakpointItem.attachment.view.lineNumber,
                             BREAKPOINT_CONDITIONAL_POPUP_POSITION,
                             BREAKPOINT_CONDITIONAL_POPUP_OFFSET_X,
                             BREAKPOINT_CONDITIONAL_POPUP_OFFSET_Y);
+    }, 100);
   },
 
   /**