add: } catch (e) { currentZoom = 100; 
context:   get textZoom() {    var currentZoom = Math.round(getMarkupDocumentViewer().textZoom * 100);    if (this.indexOf(currentZoom) == -1) {      if (currentZoom != this.factorOther) {        this.factorOther = currentZoom;        this.factorAnchor = this.factorOther;      }    }    return currentZoom;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/dfdd46cc9e3d2968a43c446c12ddde70d4e08018/viewZoomOverlay.js/buggy/xpfe/communicator/resources/content/viewZoomOverlay.js