The document
https://support.jdownloader.org/Know...aptcha-browser
"How to use another browser than your OS default to solve browser captchas"
doesn't refer to the "known bug"
The post
https://board.jdownloader.org/announcement.php?f=50 in Announcements
"Captcha issues with Firefox"
states "Update 2020-08-14: The extension has been reverted to the last working version - the workarounds below should not be needed anymore!"
What is the "last working version" mentioned here? As I wrote I tried 3.2.39 too.
If this is the known bug, then it isn't solved now.