--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -7159,19 +7159,18 @@ ReportPatternCompileFailure(nsAString& a
 
 // static
 bool
 nsContentUtils::IsPatternMatching(nsAString& aValue, nsAString& aPattern,
                                   nsIDocument* aDocument)
 {
   NS_ASSERTION(aDocument, "aDocument should be a valid pointer (not null)");
 
-  AutoJSAPI jsapi;
-  jsapi.Init();
-  JSContext* cx = jsapi.cx();
+  AutoJSContext cx;
+  AutoDisableJSInterruptCallback disabler(cx);
 
   // We can use the junk scope here, because we're just using it for
   // regexp evaluation, not actual script execution.
   JSAutoCompartment ac(cx, xpc::UnprivilegedJunkScope());
 
   // The pattern has to match the entire value.
   aPattern.Insert(NS_LITERAL_STRING("^(?:"), 0);
   aPattern.AppendLiteral(")$");