diff --git a/modules/script.js b/modules/script.js
index 3a886b810..14b752563 100644
--- a/modules/script.js
+++ b/modules/script.js
@@ -1,5 +1,11 @@
 var EXPORTED_SYMBOLS = ['Script'];
 
+try {
+  Components.utils.import('resource://gre/modules/AddonManager.jsm');
+} catch (e) {
+  // Ignore; assume we're in Firefox 3, where this is not present.
+}
+
 Components.utils.import('resource://greasemonkey/constants.js');
 Components.utils.import('resource://greasemonkey/prefmanager.js');
 Components.utils.import('resource://greasemonkey/scriptIcon.js');