ImportExportTools NG

Rated 4 out of 5 stars

by ChrisDé on ژوئن 2, 2026 · permalink

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