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PDF attachment in NEW e-mail opens in browser instead of document viewer

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Using Thunderbird 115.6.0 (64-bit) in Linux Mint MATE 21.3.

Settings|General|"Save files to is" not selected ("Always ask me where to save files" is.) "Desktop" is shown, greyed out.

Note that Settings|General, for Content Types mentioning PDF, the setting is to use Document Viewer (xreader).

Process:

1) Create new e-mail. 2) Add PDF attachment. 3) Double click on the attachment to view.

It opens in Firefox Web browser, instead of in the system's default Document Viewer.

This also creates an empty <random>.html.part file in the Desktop.

Note that viewing a PDF attachment in an incoming e-mail works fine.

It seems there are two problems: The PDF does not open in the Document Viewer, and an empty file is left behind.

The process used to work quite some time ago (many months, anyway) - not sure when.

Any ideas?

Using Thunderbird 115.6.0 (64-bit) in Linux Mint MATE 21.3. Settings|General|"Save files to is" not selected ("Always ask me where to save files" is.) "Desktop" is shown, greyed out. Note that Settings|General, for Content Types mentioning PDF, the setting is to use Document Viewer (xreader). Process: 1) Create new e-mail. 2) Add PDF attachment. 3) Double click on the attachment to view. It opens in Firefox Web browser, instead of in the system's default Document Viewer. This also creates an empty <random>.html.part file in the Desktop. Note that viewing a PDF attachment in an incoming e-mail works fine. It seems there are two problems: The PDF does not open in the Document Viewer, and an empty file is left behind. The process used to work quite some time ago (many months, anyway) - not sure when. Any ideas?

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