--- a/js/xpconnect/loader/mozJSComponentLoader.cpp
+++ b/js/xpconnect/loader/mozJSComponentLoader.cpp
@@ -66,17 +66,17 @@ static const char kJSCachePrefix[] = "js
 
 /**
  * Buffer sizes for serialization and deserialization of scripts.
  * FIXME: bug #411579 (tune this macro!) Last updated: Jan 2008
  */
 #define XPC_SERIALIZATION_BUFFER_SIZE   (64 * 1024)
 #define XPC_DESERIALIZATION_BUFFER_SIZE (12 * 8192)
 
-// NSPR_LOG_MODULES=JSComponentLoader:5
+// MOZ_LOG=JSComponentLoader:5
 static LazyLogModule gJSCLLog("JSComponentLoader");
 
 #define LOG(args) MOZ_LOG(gJSCLLog, mozilla::LogLevel::Debug, args)
 
 // Components.utils.import error messages
 #define ERROR_SCOPE_OBJ "%s - Second argument must be an object."
 #define ERROR_NOT_PRESENT "%s - EXPORTED_SYMBOLS is not present."
 #define ERROR_NOT_AN_ARRAY "%s - EXPORTED_SYMBOLS is not an array."

--- a/js/xpconnect/src/XPCLog.h
+++ b/js/xpconnect/src/XPCLog.h
@@ -7,22 +7,21 @@
 /* Debug Logging support. */
 
 #ifndef xpclog_h___
 #define xpclog_h___
 
 #include "mozilla/Logging.h"
 
 /*
- * This uses prlog.h See prlog.h for environment settings for output.
- * The module name used here is 'xpclog'. These environment settings
- * should work...
+ * This uses mozilla/Logging.h. The module name used here is 'xpclog'.
+ * These environment settings should work...
  *
- * SET NSPR_LOG_MODULES=xpclog:5
- * SET NSPR_LOG_FILE=logfile.txt
+ * SET MOZ_LOG=xpclog:5
+ * SET MOZ_LOG_FILE=logfile.txt
  *
  * usage:
  *   XPC_LOG_ERROR(("my comment number %d", 5))   // note the double parens
  *
  */
 
 #ifdef DEBUG
 #define XPC_LOG_INTERNAL(number,_args)  \