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Constantly losing application/file-type connections after update with no ability to fix

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I download csv files and can't get excell to open them automatically as it usually does, after updating Firefox. I can't fix in "Applications" under General Settings.

I download csv files and can't get excell to open them automatically as it usually does, after updating Firefox. I can't fix in "Applications" under General Settings.

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See Manage file types and download actions in Firefox under File types and download actions. It could be a problem with the MIME type that the web server uses for .csv files. A link to a problem file might be helpful.

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