diff --git a/browser/devtools/debugger/test/browser_dbg_bug723069_editor-breakpoints.js b/browser/devtools/debugger/test/browser_dbg_bug723069_editor-breakpoints.js
index ac6fa0bbecd..405ca729601 100644
--- a/browser/devtools/debugger/test/browser_dbg_bug723069_editor-breakpoints.js
+++ b/browser/devtools/debugger/test/browser_dbg_bug723069_editor-breakpoints.js
@@ -23,37 +23,44 @@ function test()
   let SourceEditor = tempScope.SourceEditor;
   let scriptShown = false;
   let framesAdded = false;
+  let resumed = false;
+  let testStarted = false;
 
   debug_tab_pane(TAB_URL, function(aTab, aDebuggee, aPane) {
     gTab = aTab;
     gDebuggee = aDebuggee;
     gPane = aPane;
     gDebugger = gPane.debuggerWindow;
+    resumed = true;
+
     gDebugger.DebuggerController.activeThread.addOneTimeListener("framesadded", function() {
       framesAdded = true;
-      runTest();
+      executeSoon(startTest);
     });
 
-    gDebuggee.firstCall();
+    executeSoon(function() {
+      gDebuggee.firstCall();
+    });
   });
 
-  window.addEventListener("Debugger:ScriptShown", function _onEvent(aEvent) {
-    let url = aEvent.detail.url;
-    if (url.indexOf("-02.js") != -1) {
-      scriptShown = true;
-      window.removeEventListener(aEvent.type, _onEvent);
-      runTest();
-    }
-  });
-
-  function runTest()
+  function onScriptShown(aEvent)
   {
-    if (scriptShown && framesAdded) {
-      Services.tm.currentThread.dispatch({ run: onScriptShown }, 0);
+    scriptShown = aEvent.detail.url.indexOf("-02.js") != -1;
+    executeSoon(startTest);
+  }
+
+  window.addEventListener("Debugger:ScriptShown", onScriptShown);
+
+  function startTest()
+  {
+    if (scriptShown && framesAdded && resumed && !testStarted) {
+      window.removeEventListener("Debugger:ScriptShown", onScriptShown);
+      testStarted = true;
+      Services.tm.currentThread.dispatch({ run: performTest }, 0);
     }
   }
 
-  function onScriptShown()
+  function performTest()
   {
     gScripts = gDebugger.DebuggerView.Scripts;
 
diff --git a/browser/devtools/debugger/test/browser_dbg_bug731394_editor-contextmenu.js b/browser/devtools/debugger/test/browser_dbg_bug731394_editor-contextmenu.js
index 385e124cd29..e9b8b9fdbbd 100644
--- a/browser/devtools/debugger/test/browser_dbg_bug731394_editor-contextmenu.js
+++ b/browser/devtools/debugger/test/browser_dbg_bug731394_editor-contextmenu.js
@@ -21,37 +21,43 @@ function test()
   let contextMenu = null;
   let scriptShown = false;
   let framesAdded = false;
+  let resumed = false;
+  let testStarted = false;
 
   debug_tab_pane(TAB_URL, function(aTab, aDebuggee, aPane) {
     gTab = aTab;
     gDebuggee = aDebuggee;
     gPane = aPane;
     gDebugger = gPane.debuggerWindow;
+    resumed = true;
 
     gDebugger.DebuggerController.activeThread.addOneTimeListener("framesadded", function() {
       framesAdded = true;
-      runTest();
+      executeSoon(startTest);
+    });
+
+    executeSoon(function() {
+      gDebuggee.firstCall();
     });
-    gDebuggee.firstCall();
   });
 
-  window.addEventListener("Debugger:ScriptShown", function _onEvent(aEvent) {
-    let url = aEvent.detail.url;
-    if (url.indexOf("-02.js") != -1) {
-      scriptShown = true;
-      window.removeEventListener(aEvent.type, _onEvent);
-      runTest();
-    }
-  });
+  function onScriptShown(aEvent) {
+    scriptShown = aEvent.detail.url.indexOf("-02.js") != -1;
+    executeSoon(startTest);
+  }
 
-  function runTest()
+  window.addEventListener("Debugger:ScriptShown", onScriptShown);
+
+  function startTest()
   {
-    if (scriptShown && framesAdded) {
-      Services.tm.currentThread.dispatch({ run: onScriptShown }, 0);
+    if (scriptShown && framesAdded && resumed && !testStarted) {
+      testStarted = true;
+      window.removeEventListener("Debugger:ScriptShown", onScriptShown);
+      Services.tm.currentThread.dispatch({ run: performTest }, 0);
     }
   }
 
-  function onScriptShown()
+  function performTest()
   {
     let scripts = gDebugger.DebuggerView.Scripts._scripts;
 
diff --git a/browser/devtools/debugger/test/browser_dbg_script-switching.js b/browser/devtools/debugger/test/browser_dbg_script-switching.js
index ee1fba7e70a..a3548c4e89c 100644
--- a/browser/devtools/debugger/test/browser_dbg_script-switching.js
+++ b/browser/devtools/debugger/test/browser_dbg_script-switching.js
@@ -18,33 +18,39 @@ function test()
 {
   let scriptShown = false;
   let framesAdded = false;
+  let resumed = false;
+  let testStarted = false;
 
   debug_tab_pane(TAB_URL, function(aTab, aDebuggee, aPane) {
     gTab = aTab;
     gDebuggee = aDebuggee;
     gPane = aPane;
     gDebugger = gPane.debuggerWindow;
+    resumed = true;
 
     gDebugger.DebuggerController.activeThread.addOneTimeListener("framesadded", function() {
       framesAdded = true;
-      runTest();
+      executeSoon(startTest);
     });
 
-    gDebuggee.firstCall();
+    executeSoon(function() {
+      gDebuggee.firstCall();
+    });
   });
 
-  window.addEventListener("Debugger:ScriptShown", function _onEvent(aEvent) {
-    let url = aEvent.detail.url;
-    if (url.indexOf("-02.js") != -1) {
-      scriptShown = true;
-      window.removeEventListener(aEvent.type, _onEvent);
-      runTest();
-    }
-  });
-
-  function runTest()
+  function onScriptShown(aEvent)
   {
-    if (scriptShown && framesAdded) {
+    scriptShown = aEvent.detail.url.indexOf("-02.js") != -1;
+    executeSoon(startTest);
+  }
+
+  window.addEventListener("Debugger:ScriptShown", onScriptShown);
+
+  function startTest()
+  {
+    if (scriptShown && framesAdded && resumed && !testStarted) {
+      window.removeEventListener("Debugger:ScriptShown", onScriptShown);
+      testStarted = true;
       Services.tm.currentThread.dispatch({ run: testScriptsDisplay }, 0);
     }
   }
@@ -75,8 +81,6 @@ function testScriptsDisplay() {
   ok(gDebugger.DebuggerView.Scripts.containsLabel(
     label2), "Second script label is incorrect.");
 
-  dump("Debugger editor text:\n" + gDebugger.editor.getText() + "\n");
-
   ok(gDebugger.editor.getText().search(/debugger/) != -1,
     "The correct script was loaded initially.");
 
@@ -96,8 +100,6 @@ function testScriptsDisplay() {
 
 function testSwitchPaused()
 {
-  dump("Debugger editor text:\n" + gDebugger.editor.getText() + "\n");
-
   ok(gDebugger.editor.getText().search(/debugger/) == -1,
     "The second script is no longer displayed.");
 
diff --git a/browser/devtools/debugger/test/browser_dbg_update-editor-mode.js b/browser/devtools/debugger/test/browser_dbg_update-editor-mode.js
index 972abbb5d04..68b3c67358c 100644
--- a/browser/devtools/debugger/test/browser_dbg_update-editor-mode.js
+++ b/browser/devtools/debugger/test/browser_dbg_update-editor-mode.js
@@ -22,32 +22,38 @@ function test()
 {
   let scriptShown = false;
   let framesAdded = false;
+  let testStarted = false;
+  let resumed = false;
 
   debug_tab_pane(TAB_URL, function(aTab, aDebuggee, aPane) {
     gTab = aTab;
     gDebuggee = aDebuggee;
     gPane = aPane;
     gDebugger = gPane.debuggerWindow;
+    resumed = true;
 
     gDebugger.DebuggerController.activeThread.addOneTimeListener("framesadded", function() {
       framesAdded = true;
-      runTest();
+      executeSoon(startTest);
+    });
+
+    executeSoon(function() {
+      gDebuggee.firstCall();
     });
-    gDebuggee.firstCall();
   });
 
-  window.addEventListener("Debugger:ScriptShown", function _onEvent(aEvent) {
-    let url = aEvent.detail.url;
-    if (url.indexOf("editor-mode") != -1) {
-      scriptShown = true;
-      window.removeEventListener(aEvent.type, _onEvent);
-      runTest();
-    }
-  });
+  function onScriptShown(aEvent) {
+    scriptShown = aEvent.detail.url.indexOf("test-editor-mode") != -1;
+    executeSoon(startTest);
+  }
 
-  function runTest()
+  window.addEventListener("Debugger:ScriptShown", onScriptShown);
+
+  function startTest()
   {
-    if (scriptShown && framesAdded) {
+    if (scriptShown && framesAdded && resumed && !testStarted) {
+      window.removeEventListener("Debugger:ScriptShown", onScriptShown);
+      testStarted = true;
       Services.tm.currentThread.dispatch({ run: testScriptsDisplay }, 0);
     }
   }