urlSecurityCheck(href, gBrowser.currentURI.spec, 
urlSecurityCheck(href, gBrowser.contentPrincipal, 
  subscribeToFeed: function(href, event) {    // Just load the feed in the content area to either subscribe or show the    // preview UI    if (!href)      href = event.target.getAttribute("feed");    urlSecurityCheck(href, gBrowser.currentURI.spec,                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT_OR_DATA);    var feedURI = makeURI(href, document.characterSet);    // Use the feed scheme so X-Moz-Is-Feed will be set    // The value doesn't matter    if (/^https?/.test(feedURI.scheme))      href = "feed:" + href;    this.loadFeed(href, event);  },
5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5872/323286399cc3e12b9d640d15efcc6c52f3676e5e/browser.js/clean/browser/base/content/browser.js