Bug 413275 - "JavaScript Error: "sourceProfiles is null when Migration Wizard is canceled" (Return FALSE to avoid advancing to next page when not necessary) [p=mredivo@flock.com (Marcus Redivo) r=gavin a=blocking-firefox3+]

browser/components/migration/content/migration.js

@@ -158,7 +158,7 @@ var MigrationWizard = {
       if(newSource == "fromfile")
         window.opener.fromFile = true;
       document.documentElement.cancel();
-      return;
+      return false;
     }
     
     if (!this._migrator || (newSource != this._source)) {

browser/components/migration/content/migration.xul

@@ -56,7 +56,7 @@
 
   <wizardpage id="importSource" pageid="importSource" next="selectProfile"
               label="&importSource.title;"
-              onpageadvanced="MigrationWizard.onImportSourcePageAdvanced();">
+              onpageadvanced="return MigrationWizard.onImportSourcePageAdvanced();">
 #ifdef XP_WIN
     <description id="importAll" control="importSourceGroup">&importFrom.label;</description>
 #else