--- a/devtools/client/inspector/breadcrumbs.js
+++ b/devtools/client/inspector/breadcrumbs.js
@@ -327,16 +327,17 @@ HTMLBreadcrumbs.prototype = {
 
   _init: function () {
     this.outer = this.chromeDoc.getElementById("inspector-breadcrumbs");
     this.arrowScrollBox = new ArrowScrollBox(
         this.chromeWin,
         this.outer);
 
     this.container = this.arrowScrollBox.inner;
+    this.scroll = this.scroll.bind(this);
     this.arrowScrollBox.on("overflow", this.scroll);
 
     // These separators are used for CSS purposes only, and are positioned
     // off screen, but displayed with -moz-element.
     this.separators = this.chromeDoc.createElementNS(NS_XHTML, "div");
     this.separators.className = "breadcrumb-separator-container";
     this.separators.innerHTML =
                       "<div id='breadcrumb-separator-before'></div>" +