diff --git a/dom/workers/WorkerPrefs.h b/dom/workers/WorkerPrefs.h
index 415435cf06..31a00e4290 100644
--- a/dom/workers/WorkerPrefs.h
+++ b/dom/workers/WorkerPrefs.h
@@ -26,6 +26,7 @@ WORKER_SIMPLE_PREF("browser.dom.window.dump.enabled", DumpEnabled, DUMP)
 WORKER_SIMPLE_PREF("canvas.imagebitmap_extensions.enabled", ImageBitmapExtensionsEnabled, IMAGEBITMAP_EXTENSIONS_ENABLED)
 WORKER_SIMPLE_PREF("dom.caches.enabled", DOMCachesEnabled, DOM_CACHES)
 WORKER_SIMPLE_PREF("dom.caches.testing.enabled", DOMCachesTestingEnabled, DOM_CACHES_TESTING)
+WORKER_SIMPLE_PREF("dom.min_timeout_value", DOMMinTimoutValue, DOM_MIN_TIMEOUT_VALUE)
 WORKER_SIMPLE_PREF("dom.performance.enable_user_timing_logging", PerformanceLoggingEnabled, PERFORMANCE_LOGGING_ENABLED)
 WORKER_SIMPLE_PREF("dom.webnotifications.enabled", DOMWorkerNotificationEnabled, DOM_WORKERNOTIFICATION)
 WORKER_SIMPLE_PREF("dom.webnotifications.serviceworker.enabled", DOMServiceWorkerNotificationEnabled, DOM_SERVICEWORKERNOTIFICATION)
diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 7a0c272f56..35d8dd744b 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -1995,13 +1995,27 @@ struct WorkerPrivate::TimeoutInfo
     mNestingLevel = kClampTimeoutNestingLevel;
   }
 
-  void CalculateTargetTime() {
+  void CalculateTargetTime(JSContext* aCx) {
     auto target = mInterval;
+    int32_t minTimeoutValue;
+    
+    if (NS_IsMainThread()) {
+      // We can get the pref value directly.
+      minTimeoutValue = Preferences::GetInt("dom.min_timeout_value");
+    } else {
+      // We're on a worker thread; go through WorkerPrivate.
+      WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
+      if (workerPrivate) {
+        minTimeoutValue = workerPrivate->DOMMinTimoutValue();
+      } else {
+        // fall back to default 4 ms
+        minTimeoutValue = 4;
+      }
+    }
+      
     // Clamp timeout for workers, except chrome workers
     if (mNestingLevel >= kClampTimeoutNestingLevel && !mOnChromeWorker) {
-      target = TimeDuration::Max(
-          mInterval,
-          TimeDuration::FromMilliseconds(Preferences::GetInt("dom.min_timeout_value")));
+      target = TimeDuration::Max(mInterval,TimeDuration::FromMilliseconds(minTimeoutValue));
     }
     mTargetTime = TimeStamp::Now() + target;
   }
@@ -6387,7 +6401,7 @@ WorkerPrivate::RunExpiredTimeouts(JSContext* aCx)
         // Reschedule intervals.
         // Reschedule a timeout and, if needed, increase the nesting level.
         info->AccumulateNestingLevel(info->mNestingLevel);
-        info->CalculateTargetTime();
+        info->CalculateTargetTime(aCx);
         // Don't re-sort the list here, we'll do that at the end.
         ++index;
       }