rem: this.wsm.savePageData( oldURL ); 
add: this.wsm.savePageData( oldURL, null ); 
context:       switchPage:        function (aNewURL, aNewTag)          {            var oldURL = document.getElementById( this.contentFrame ).getAttribute("tag");            if( !oldURL )              {                oldURL = document.getElementById( this.contentFrame ).getAttribute("src");              }            this.wsm.savePageData( oldURL );      // save data from the current page.             if( aNewURL != oldURL )              {                document.getElementById( this.contentFrame ).setAttribute( "src", aNewURL );                if( !aNewTag )                  document.getElementById( this.contentFrame ).removeAttribute( "tag" );                else                  document.getElementById( this.contentFrame ).setAttribute( "tag", aNewTag );              }          },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/b9821bb9ef46a8fffc4f5f05416d168d1a84ed89/nsPrefWindow.js/clean/mail/components/prefwindow/content/nsPrefWindow.js