--- a/toolkit/components/aboutcheckerboard/content/aboutCheckerboard.js
+++ b/toolkit/components/aboutcheckerboard/content/aboutCheckerboard.js
@@ -11,17 +11,19 @@ var reports;
 function onLoad() {
   trace = document.getElementById("trace");
   service = new CheckerboardReportService();
   updateEnabled();
   reports = service.getReports();
   for (var i = 0; i < reports.length; i++) {
     let text = "Severity " + reports[i].severity + " at " + new Date(reports[i].timestamp).toString();
     let link = document.createElement("a");
-    link.href = "javascript:showReport(" + i + ")";
+    link.href = "#";
+    let index = i; // for capturing in the lambda
+    link.addEventListener('click', function() { showReport(index); return false; });
     link.textContent = text;
     let bullet = document.createElement("li");
     bullet.appendChild(link);
     document.getElementById(reports[i].reason).appendChild(bullet);
   }
 }
 
 function updateEnabled() {