--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -5148,23 +5148,23 @@ var ErrorPageEventHandler = {
             errorDoc.location = "about:home";
           }
         } else if (errorDoc.documentURI.startsWith("about:blocked")) {
           // The event came from a button on a malware/phishing block page
           // First check whether it's malware, phishing or unwanted, so that we
           // can use the right strings/links
           let bucketName = "";
           let sendTelemetry = false;
-          if (errorDoc.documentURI.contains("e=malwareBlocked")) {
+          if (errorDoc.documentURI.includes("e=malwareBlocked")) {
             sendTelemetry = true;
             bucketName = "WARNING_MALWARE_PAGE_";
-          } else if (errorDoc.documentURI.contains("e=deceptiveBlocked")) {
+          } else if (errorDoc.documentURI.includes("e=deceptiveBlocked")) {
             sendTelemetry = true;
             bucketName = "WARNING_PHISHING_PAGE_";
-          } else if (errorDoc.documentURI.contains("e=unwantedBlocked")) {
+          } else if (errorDoc.documentURI.includes("e=unwantedBlocked")) {
             sendTelemetry = true;
             bucketName = "WARNING_UNWANTED_PAGE_";
           }
           let nsISecTel = Ci.nsISecurityUITelemetry;
           let isIframe = (errorDoc.defaultView.parent === errorDoc.defaultView);
           bucketName += isIframe ? "TOP_" : "FRAME_";
 
           let formatter = Cc["@mozilla.org/toolkit/URLFormatterService;1"].getService(Ci.nsIURLFormatter);