If you are trying to edit the embedded attachments with Firefox you should also ensure you have the following add-on installed: https://confluence.atlassian.com/display/AOD/Installing+the+Firefox+Add-On+for+the+Office+Connector
Additional documentation on this tool is available here: https://addons.mozilla.org/en-US/firefox/addon/webdav-launcher/
Could you confirm how these spreadsheets are currently embedded, are they just attached or embdedded with the office macro's?
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