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After updating Firefox all documents as attachments download as attachment.ashx. not recognized! Why? impossible to work with this

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Since I downloaded the new update for Firefox onto my Mac all email attachments coming through on my Webmail 'Outlook' app for Mac, regardless of document type (even Adobe pdfs) are downloaded as attachment.ashx This is not recognised and then requires me to manually search for Microsoft word or adobe. This never ever did this before I updated this week. How can I ditch this update or fix it or revert to an earlier version?

Since I downloaded the new update for Firefox onto my Mac all email attachments coming through on my Webmail 'Outlook' app for Mac, regardless of document type (even Adobe pdfs) are downloaded as attachment.ashx This is not recognised and then requires me to manually search for Microsoft word or adobe. This never ever did this before I updated this week. How can I ditch this update or fix it or revert to an earlier version?

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Outlook Web Access sends illegal Content-Disposition headers and this is no longer allowed in Firefox 8. The server needs to be fixed. See: