context: function getPostStream(context){    try    {        var webNav = context.browser.webNavigation;        var descriptor = QI(webNav, CI("nsIWebPageDescriptor")).currentDescriptor;        var entry = QI(descriptor, CI("nsISHEntry"));                if (entry.postData)        {            // Seek to the beginning, or it will probably start reading at the end            var postStream = QI(entry.postData, CI("nsISeekableStream"));            postStream.seek(0, 0);                    return postStream;        }     }     catch (exc)     {     }}
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