Since Linux Fedora 33 onwards, on Plasma KDE desktop, thunderbird crashes when using the file picker, no matter if for attaching a file or to save an attached file or printing a mail to pdf of saving a mail. It can open attachments directly (i.e. it can open a .doc file for example on Libreoffice, or a picture or a pdf with wichsoever programm), but it crashes if I try to safe the attachment or print a mail to pdf or whatever action where the file picker is involved. Firefox does not have this issue. I also did not have this issue on the Fedoras until 32, it began with the 33.