diff --git a/dom/base/crashtests/1181619.html b/dom/base/crashtests/1181619.html
new file mode 100644
index 00000000000..929207964da
--- /dev/null
+++ b/dom/base/crashtests/1181619.html
@@ -0,0 +1,14 @@
+
+
+
+
+
diff --git a/dom/base/crashtests/crashtests.list b/dom/base/crashtests/crashtests.list
index ce5f65fc9fd..bbc2211af5d 100644
--- a/dom/base/crashtests/crashtests.list
+++ b/dom/base/crashtests/crashtests.list
@@ -203,3 +203,4 @@ load xhr_html_nullresponse.html
load structured_clone_container_throws.html
load 1154598.xhtml
load 1157995.html
+load 1181619.html
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 2a474e1c8d0..3a76b314b7c 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -12014,6 +12014,7 @@ nsGlobalWindow::RunTimeoutHandler(nsTimeout* aTimeout,
// New script entry point required, due to the "Create a script" sub-step of
// http://www.whatwg.org/specs/web-apps/current-work/#timer-initialisation-steps
+ nsAutoMicroTask mt;
AutoEntryScript entryScript(this, reason, true, aScx->GetNativeContext());
entryScript.TakeOwnershipOfErrorReporting();
JS::CompileOptions options(entryScript.cx());
diff --git a/dom/base/nsJSUtils.cpp b/dom/base/nsJSUtils.cpp
index c15513a5b58..8464991b218 100644
--- a/dom/base/nsJSUtils.cpp
+++ b/dom/base/nsJSUtils.cpp
@@ -174,6 +174,8 @@ nsJSUtils::EvaluateString(JSContext* aCx,
MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(aEvaluationGlobal) ==
aEvaluationGlobal);
MOZ_ASSERT_IF(aOffThreadToken, aCompileOptions.noScriptRval);
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(nsContentUtils::IsInMicroTask());
// Unfortunately, the JS engine actually compiles scripts with a return value
// in a different, less efficient way. Furthermore, it can't JIT them in many
@@ -183,7 +185,6 @@ nsJSUtils::EvaluateString(JSContext* aCx,
// aCompileOptions.noScriptRval set to true.
aRetValue.setUndefined();
- nsAutoMicroTask mt;
nsresult rv = NS_OK;
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
diff --git a/dom/base/nsScriptLoader.cpp b/dom/base/nsScriptLoader.cpp
index d2ff823ac27..55bbfd1ccc0 100644
--- a/dom/base/nsScriptLoader.cpp
+++ b/dom/base/nsScriptLoader.cpp
@@ -1113,6 +1113,7 @@ nsScriptLoader::EvaluateScript(nsScriptLoadRequest* aRequest,
// New script entry point required, due to the "Create a script" sub-step of
// http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block
+ nsAutoMicroTask mt;
AutoEntryScript entryScript(globalObject, "