getBrowser() - > gBrowser. more nsIDOMChromeWindow support

minimo/chrome/content/common.js

@@ -49,8 +49,12 @@
  */
 
 function syncUIZoom() {
+  try
+  {
     var currentUILevel=gPref.getIntPref("browser.display.zoomui");
     document.styleSheets[1].cssRules[1].style.fontSize=currentUILevel+"px";
+  }
+  catch (e) {}
 }