diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index fc486ad74e20f..6a87de27620af 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -3893,37 +3893,102 @@ JS
 :
 Rooted
 <
+JSObject
+*
+>
+global
+(
+aCx
 JS
 :
 :
-Value
->
-rval
+CurrentGlobalOrNull
 (
 aCx
 )
+)
 ;
-IgnoredErrorResult
-rv
-;
+JS
+:
+:
+Rooted
+<
+JS
+:
+:
+Value
+>
+callable
+(
+aCx
+JS
+:
+:
+ObjectOrNullValue
+(
 mHandler
 -
 >
-Call
+CallableOrNull
 (
-{
-}
-&
+)
+)
+)
+;
+JS
+:
+:
+HandleValueArray
+args
+=
+JS
+:
+:
+HandleValueArray
+:
+:
+empty
+(
+)
+;
+JS
+:
+:
+Rooted
+<
+JS
+:
+:
+Value
+>
 rval
-rv
+(
+aCx
 )
 ;
-return
-!
-rv
+/
+/
+WorkerRunnable
+:
+:
+Run
+will
+report
+the
+exception
+if
+it
+happens
 .
-Failed
+return
+JS_CallFunctionValue
 (
+aCx
+global
+callable
+args
+&
+rval
 )
 ;
 }
diff --git a/dom/workers/test/WorkerDebugger.initialize_waiting_debugger.js b/dom/workers/test/WorkerDebugger.initialize_waiting_debugger.js
index 98ca9edb646fb..3b371a07bf2e9 100644
--- a/dom/workers/test/WorkerDebugger.initialize_waiting_debugger.js
+++ b/dom/workers/test/WorkerDebugger.initialize_waiting_debugger.js
@@ -14,12 +14,6 @@ n
 "
 )
 ;
-setImmediate
-(
-function
-(
-)
-{
 postMessage
 (
 "
@@ -29,6 +23,3 @@ ran
 "
 )
 ;
-}
-)
-;