diff --git a/src/core.js b/src/core.js
index fd3dec059..4dd7a90b8 100644
--- a/src/core.js
+++ b/src/core.js
@@ -8,7 +8,7 @@ var globalScope = (typeof window === 'undefined') ? this : window;
 var isWorker = (typeof window == 'undefined');
 
 var ERRORS = 0, WARNINGS = 1, TODOS = 5;
-var verbosity = TODOS;
+var verbosity = WARNINGS;
 
 // The global PDFJS object exposes the API
 // In production, it will be declared outside a global wrapper
@@ -16,7 +16,6 @@ var verbosity = TODOS;
 if (!globalScope.PDFJS) {
   globalScope.PDFJS = {};
 }
-PDFJS.disableWorker = true;
 // getPdf()
 // Convenience function to perform binary Ajax GET
 // Usage: getPdf('http://...', callback)