rem: var soughtShell = aDocShell; var shell = findChildShell(null, browser.docShell, soughtShell); if (shell) 
add: if (this._findChildShell(browser.docShell, aDocShell)) 
context:   _getBrowser: function (aDocShell)  {    var tabbrowser = getBrowser();    for (var i = 0; i < tabbrowser.browsers.length; ++i) {      var browser = tabbrowser.getBrowserAtIndex(i);      var soughtShell = aDocShell;      var shell = findChildShell(null, browser.docShell, soughtShell);      if (shell)        return browser;    }    return null;  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/0c069551201c44cd92a1a0e08557520fc75094ef/browser.js/buggy/browser/base/content/browser.js