ExtJS button running away in Firefox

,tbar:[{
			xtype: 'xxx'
			,emptyText: ' ... '
			,store:  new Ext.data.SimpleStore({
    	        fields: ['d','v'], ...
	        })
			,id: 'idx'	
			,listeners: {
                'select': {fn: this.changeSearch,scope:this}
            }
		},{
		    xtype: 'textfield'
		    ,id: 'sid'
		    ,emptyText: _('search...')
		    ,listeners: {
		        'change': {fn:this.search,scope:this}
		        ,'render': {fn: function(cmp) {
		            new Ext.KeyMap(cmp.getEl(), {
		                key: Ext.EventObject.ENTER
		                ,fn: function() {
		                    this.fireEvent('change',this);
		                    this.blur();
		                    return true;
        		        }
                		,scope: cmp
		            });
		        },scope:this}
		    }
		},'->',{
		   text: _('create')
		   ,handler: { xtype: 'scc-window-create' ,blankValues: true }
		   ,align: 'right'
		}]