rem: var docCharset = getBrowser().docShell.QueryInterface( Components.interfaces.nsIDocCharset); 
add: var docCharset = gBrowser.docShell .QueryInterface(Components.interfaces.nsIDocCharset); 
context: function BrowserSetForcedCharacterSet(aCharset){  var docCharset = getBrowser().docShell.QueryInterface(                            Components.interfaces.nsIDocCharset);  docCharset.charset = aCharset;  var PageLoader = getBrowser().webNavigation.QueryInterface(pageLoaderIface);  PageLoader.LoadPage(PageLoader.currentDescriptor, pageLoaderIface.DISPLAY_NORMAL);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/87d41981addf2e045f5c8f7d792f12a31742f872/viewSource.js/buggy/toolkit/components/viewsource/content/viewSource.js