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Opening PDF attachments when in Write Screen

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I get this error message when trying to open a pdf when I am in the write screen. I like to look at the attachment before sending it and I get this message. The preference in settings is to use Adobe to open PDF files. It opens them fine when you are opening them from a received message. This error only happens when trying to look at an outgoing message attachment. Any suggestions to fix this error.

I get this error message when trying to open a pdf when I am in the write screen. I like to look at the attachment before sending it and I get this message. The preference in settings is to use Adobe to open PDF files. It opens them fine when you are opening them from a received message. This error only happens when trying to look at an outgoing message attachment. Any suggestions to fix this error.
Iqhotyoshelwe imifanekiso ekwisikrini

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The error is known and people are looking into it. https://bugzilla.mozilla.org/show_bug.cgi?id=1729922

The bug mentioned above has been marked as a duplicate of this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1698140

So whilst there seems to be a difference is results, the issue is the same problem.