I recently added SSRS Reports to our C# .NET application using SSRS 2008 R2 and ReportViewer 2010 (remote processing). When I view a report using any version of Firefox the "Report is being generated" message and progress spinner are not being displayed. Is this documented somewhere as a known issue in Firefox? I have done a lot of research regarding what is not supportable in browsers other than IE but I cannot find anything that specifically addresses the progress spinner and message. Thanks.