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How to fix the MIME-Type of PDF attachments in Thunderbird E-Mails

Recent versions of Mozilla Thunderbird set a wrong MIME-Type for PDF-files that are attached to an E-Mail. Thunderbird sets the MIME-Type to text/html instead of pdf/application. As a result the mail client of the receiver tries to display the PDF-file as plaintext and this leads most of the times to a system lock or crash of the mail client. I really don’t know why Mozilla did this, but I’m sure that they had their reasons, because the problem is very obvious and also easy to fix:
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