--- a/im/modules/ibCore.jsm
+++ b/im/modules/ibCore.jsm
@@ -163,17 +163,17 @@ var Core = {
   showAddons: function() {
     this.showWindow("Addons:Manager",
                     "chrome://instantbird/content/extensions.xul", "Addons",
                     "chrome,menubar,extrachrome,toolbar,dialog=no,resizable,centerscreen");
   },
   showContacts: function() {
     this.showWindow("Messenger:blist",
                     "chrome://instantbird/content/blist.xul", "Contacts",
-                    "chrome,dialog=no,all");
+                    "chrome,dialog=no,all,resizable");
   },
   showPreferences: function() {
     this.showWindow("Messenger:Preferences",
                     "chrome://instantbird/content/preferences/preferences.xul",
                     "Preferences",
                     "chrome,titlebar,toolbar,centerscreen,dialog=no");
   },
   showUpdates: function() {