rem: observe: function(aSubject, aTopic, aData) 
add: observe: function(aPrefBranch, aTopic, aPrefName) 
context:     observe: function(aSubject, aTopic, aData)    {      setTimeout(FinishPrintPreview, 0);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/ea42bd5eb244640e6be7294e3f5e75a852c40fa2/browser.js/buggy/browser/base/content/browser.js