From your system details aside, it appears you are using firefox 7.01 on a windows 64bit machine. You should be able to verify that using * Firefox Button -> Help -> about firefox * or Firefox Button -> Help -> Troubleshooting information Does that help ? Some sites do not like Firefox 7. If you have problems with just one site not Firefox 3.6 is that last secure version supported (Firefox 3.6.23 - soon to be 3.6.24. ). You could consider downgrading, or alternatively use firefox portable on the one problem site, and keep Firefox 7 for daily browsing use. * see [[installing a previous version of firefox]] * and http://portableapps.com/apps/internet/firefox_portable/localization#legacy36