--- a/xpcom/threads/BackgroundHangMonitor.cpp
+++ b/xpcom/threads/BackgroundHangMonitor.cpp
@@ -24,17 +24,17 @@
 #include "nsIObserverService.h"
 #include "nsIObserver.h"
 #include "mozilla/Services.h"
 #include "nsXULAppAPI.h"
 
 #include <algorithm>
 
 // Activate BHR only for one every BHR_BETA_MOD users.
-#define BHR_BETA_MOD 100;
+#define BHR_BETA_MOD 2;
 
 // Maximum depth of the call stack in the reported thread hangs. This value represents
 // the 99.9th percentile of the thread hangs stack depths reported by Telemetry.
 static const size_t kMaxThreadHangStackDepth = 30;
 
 // An utility comparator function used by std::unique to collapse "(* script)" entries in
 // a vector representing a call stack.
 bool StackScriptEntriesCollapser(const char* aStackEntry, const char *aAnotherStackEntry)