http://support.mozilla.com/nl/questions/895024

   https://support.mozilla.com/en-US/search?q=attachement.ashx+mac

   https://discussions.apple.com/message/10814672#10814672

   https://support.mozilla.com/en-US/questions/897957

   https://www.mozilla.org/en-US/plugincheck/

     http://www.adobe.com/software/flash/about/

    Tools > Add-ons

Although you are using a Mac, if you are using Outlook Web Access with Word, it sends an illegal Content-Dispositon header to Firefox. This is no longer allowed in Firefox 8. Firefox 9 will have a workaround for this so that Microsoft has time to fix their software. See <br /><br /> http://support.mozilla.com/nl/questions/895024 https://support.mozilla.com/en-US/search?q=attachement.ashx+mac See also the threads <br /><br /> https://discussions.apple.com/message/10814672#10814672 https://support.mozilla.com/en-US/questions/897957 and check to see that your plug-ins are up-to-date: <br /><br /> https://www.mozilla.org/en-US/plugincheck/ Also test your Flash player on Adobe's website and confirm the version (please check using each browser, if you have, say, IE & Firefox installed) <br /><br /> http://www.adobe.com/software/flash/about/ Also, check also that your add-ons are up-to-date, from Firefox's menu bar: <br /><br /> Tools > Add-ons ---- add apple thread