diff --git a/testing/marionette/components/marionette.js b/testing/marionette/components/marionette.js
index cc42238082b4..cd159ca4ff2e 100644
--- a/testing/marionette/components/marionette.js
+++ b/testing/marionette/components/marionette.js
@@ -310,7 +310,7 @@ class MarionetteParentProcess {
   }
 
   observe(subject, topic) {
-    log.debug(`Received observer notification ${topic}`);
+    log.trace(`Received observer notification ${topic}`);
 
     switch (topic) {
       case "nsPref:changed":
@@ -400,7 +400,7 @@ class MarionetteParentProcess {
         }
 
         if (this.gfxWindow) {
-          log.debug("GFX sanity window detected, waiting until it has been closed...");
+          log.trace("GFX sanity window detected, waiting until it has been closed...");
           Services.obs.addObserver(this, "domwindowclosed");
         } else {
           Services.obs.addObserver(this, "xpcom-will-shutdown");
@@ -421,7 +421,7 @@ class MarionetteParentProcess {
     win.addEventListener("load", () => {
       if (win.document.getElementById("safeModeDialog")) {
         // accept the dialog to start in safe-mode
-        log.debug("Safe mode detected, supressing dialog");
+        log.trace("Safe mode detected, supressing dialog");
         win.setTimeout(() => {
           win.document.documentElement.getButton("accept").click();
         });
@@ -436,15 +436,15 @@ class MarionetteParentProcess {
       return;
     }
 
-    log.debug(`Waiting for delayed startup...`);
+    log.trace(`Waiting until startup recorder finished recording startup scripts...`);
     Services.tm.idleDispatchToMainThread(async () => {
       let startupRecorder = Promise.resolve();
       if ("@mozilla.org/test/startuprecorder;1" in Cc) {
-        log.debug(`Waiting for startup tests...`);
         startupRecorder = Cc["@mozilla.org/test/startuprecorder;1"]
             .getService().wrappedJSObject.done;
       }
       await startupRecorder;
+      log.trace(`All scripts recorded.`);
 
       if (MarionettePrefs.recommendedPrefs) {
         for (let [k, v] of RECOMMENDED_PREFS) {
diff --git a/testing/marionette/listener.js b/testing/marionette/listener.js
index 25fbdbb47eb4..95ede9b0e5be 100644
--- a/testing/marionette/listener.js
+++ b/testing/marionette/listener.js
@@ -155,7 +155,7 @@ const loadListener = {
       // command can return immediately if the page load is already done.
       let readyState = content.document.readyState;
       let documentURI = content.document.documentURI;
-      logger.debug(truncate`Check readyState ${readyState} for ${documentURI}`);
+      logger.trace(truncate`Check readyState ${readyState} for ${documentURI}`);
       // If the page load has already finished, don't setup listeners and
       // timers but return immediatelly.
       if (this.handleReadyState(readyState, documentURI)) {
@@ -210,7 +210,7 @@ const loadListener = {
     }
 
     let location = event.target.documentURI || event.target.location.href;
-    logger.debug(truncate`Received DOM event ${event.type} for ${location}`);
+    logger.trace(truncate`Received DOM event ${event.type} for ${location}`);
 
     switch (event.type) {
       case "beforeunload":
@@ -347,7 +347,7 @@ const loadListener = {
     const winID = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
     const curWinID = win.windowUtils.outerWindowID;
 
-    logger.debug(`Received observer notification ${topic}`);
+    logger.trace(`Received observer notification ${topic}`);
 
     switch (topic) {
       // In the case when the currently selected frame is closed,
@@ -440,7 +440,7 @@ const loadListener = {
  * an ID, we start the listeners. Otherwise, nothing happens.
  */
 function registerSelf() {
-  logger.debug("Frame script loaded");
+  logger.trace("Frame script loaded");
 
   sandboxes.clear();
   curContainer = {
@@ -457,7 +457,7 @@ function registerSelf() {
   }
 
   if (reply[0].outerWindowID === outerWindowID) {
-    logger.debug("Frame script registered");
+    logger.trace("Frame script registered");
     startListeners();
     sendAsyncMessage("Marionette:ListenersAttached", {outerWindowID});
   }
diff --git a/testing/marionette/proxy.js b/testing/marionette/proxy.js
index d9764e6e3e9d..55097c012172 100644
--- a/testing/marionette/proxy.js
+++ b/testing/marionette/proxy.js
@@ -144,7 +144,7 @@ proxy.AsyncMessageChannel = class {
       // The currently selected tab or window is closing. Make sure to wait
       // until it's fully gone.
       this.closeHandler = async ({type, target}) => {
-        log.debug(`Received DOM event ${type} for ${target}`);
+        log.trace(`Received DOM event ${type} for ${target}`);
 
         let messageManager;
         switch (type) {
@@ -165,7 +165,7 @@ proxy.AsyncMessageChannel = class {
       // the active command has to be aborted. Therefore remove all handlers,
       // and cancel any ongoing requests in the listener.
       this.dialogueObserver_ = (subject, topic) => {
-        log.debug(`Received observer notification ${topic}`);
+        log.trace(`Received observer notification ${topic}`);
 
         this.removeAllListeners_();
         // TODO(ato): It's not ideal to have listener specific behaviour here:
diff --git a/testing/marionette/server.js b/testing/marionette/server.js
index bdc5da2a4b4d..33a7df51f159 100644
--- a/testing/marionette/server.js
+++ b/testing/marionette/server.js
@@ -395,7 +395,7 @@ class TCPConnection {
 
   log_(msg) {
     let dir = (msg.origin == Message.Origin.Client ? "->" : "<-");
-    logger.trace(`${this.id} ${dir} ${msg}`);
+    logger.debug(`${this.id} ${dir} ${msg}`);
   }
 
   toString() {
diff --git a/testing/marionette/sync.js b/testing/marionette/sync.js
index ffcb45393c93..e3f7759a9c74 100644
--- a/testing/marionette/sync.js
+++ b/testing/marionette/sync.js
@@ -264,7 +264,7 @@ function Sleep(timeout) {
 function MessageManagerDestroyedPromise(messageManager) {
   return new Promise(resolve => {
     function observe(subject, topic) {
-      log.debug(`Received observer notification ${topic}`);
+      log.trace(`Received observer notification ${topic}`);
 
       if (subject == messageManager) {
         Services.obs.removeObserver(this, "message-manager-disconnect");