--- a/devtools/server/actors/webconsole.js
+++ b/devtools/server/actors/webconsole.js
@@ -805,26 +805,26 @@ WebConsoleActor.prototype =
       let type = types.shift();
       switch (type) {
         case "ConsoleAPI": {
           if (!this.consoleAPIListener) {
             break;
           }
 
           // See `window` definition. It isn't always a DOM Window.
-          let requestStartTime = this.window && this.window.performance ?
-            this.window.performance.timing.requestStart : 0;
+          let winStartTime = this.window && this.window.performance ?
+            this.window.performance.timing.navigationStart : 0;
 
           let cache = this.consoleAPIListener
                       .getCachedMessages(!this.parentActor.isRootActor);
           cache.forEach((cachedMessage) => {
             // Filter out messages that came from a ServiceWorker but happened
             // before the page was requested.
             if (cachedMessage.innerID === "ServiceWorker" &&
-                requestStartTime > cachedMessage.timeStamp) {
+                winStartTime > cachedMessage.timeStamp) {
               return;
             }
 
             let message = this.prepareConsoleMessageForRemote(cachedMessage);
             message._type = type;
             messages.push(message);
           });
           break;