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от ChrisDé Июнь 2, 2026 ·

Subject: ImportExportTools NG v15.0.0 - Export failures (EML, HTML, PDF) with Betterbird 140.9.0

Hello,

First of all, thank you for maintaining ImportExportTools NG.

I would like to report what appears to be a compatibility issue between ImportExportTools NG v15.0.0 and Betterbird 140.9.0esr-bb20 (64-bit) on Windows 11.

Environment:

Betterbird 140.9.0esr-bb20 (64-bit)
ImportExportTools NG v15.0.0
Windows 11 Pro
IMAP account

Problem:
Exports to EML, HTML and PDF consistently fail, while MBOX export works correctly.

Tests performed:

Export folder as MBOX (structured with subfolders)
Success
Folder hierarchy preserved
MBOX files created correctly
Export all messages as EML
Failure
All messages reported as errors
Destination folder remains empty
Export all messages as HTML
Failure
Folder structure and index.html are created
Messages are not exported
"undefined.html" files may appear
Export report shows 100% errors
Export all messages as PDF
Failure
100% errors reported
No PDF files created

Example:

Test folder containing 34 messages
Export report:
Total messages: 34
Total errors: 34
Exported messages: 0

Relevant Error Console messages:

TypeError: can't access property "ownerGlobal", browser is null
setDocument: Error: Cannot create sandbox
NS_ERROR_CONTENT_BLOCKED
browser is null

Additional information:
The issue occurs with multiple export formats (EML, HTML, PDF), suggesting a common problem when processing individual messages. MBOX export continues to function normally.

Please let me know if you would like additional logs, screenshots, or a test profile.

Best regards,
Chris D

от Christopher Leidigh (Разработчик) на Июнь 2, 2026 ·

Hi Chris
Thanks for the review and dinging me hard for
multiple items with this major update.

There are a few things going on, but you are
experiencing the most significant issue where
all message export (not mbox), produce files
as undefined.xyz.

This is because there was an incomplete option
migration that affects users who were using the old, default file naming format NOT the dropdown or extended formats. I eliminated this redundant mode
and now only the dropdown and extended are supported.

The good news is this can be corrected without even getting an update. This does assume nothing else is
going on, but from your info it matches the problem.

To resolve the issue do the following:
- Go to options
- Click OK to save and exit options
- Try an export
- Go back to options and modify the format to your
needs.

If you can do me the favor of posting an issue in
the Github repository indicating everything is good
, that would be helpful.

https://github.com/thunderbird/import-export-tools-ng/issues

Thanks Christopher