1686025 - MIME type overrides file extension of blob download

Status: RESOLVED DUPLICATE of bug 1684183

(Firefox :: File Handling, defect)

Description

[David Gausmann]

Attachment: test.htm

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0

Steps to reproduce:

One internal website creates files with an xml structure using blobs. The files have a custom file extension (not xml, but the content is xml). As mime type I use "text/xml; charset=UTF-8".
(See attachment for an example.)

Actual results:

The file extension is overwritten by Firefox since version 84. Up to version 83 it was correct. Chrome also doesn't replace the extension.

Expected results:

The specified file name in the download link should be used without replacing the file extension (regardless of the specified mime-type).

As a workaround I can use "application/octet-stream", but since the content of the file is xml, I would prefer text/xml.