I was able to reproduce the problem with
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0
- I downloaded that FF version (WIN 64 en-US
- Unzipped “Firefox Setup 127.0.exe”
- Launched …\core\firefox.exe
- logged in to newkanboard, opened “Task #20 Potential issue with plugin PITM”
- Clicked the PITM picture
New Tab opens with placeholder instead of image (although my nightly FF shows the picture)
So might be related to FF version 126 - 127, not to OS?
My test results:
- FF 126 (unzipped installer.exe without installation): fails to show image
- FF 127 (unzipped installer.exe without installation): fails to show image
- FF 128 (unzipped installer.exe without installation): SHOWS image
- FF 129 (unzipped installer.exe without installation): SHOWS image