Using the address book import fails to show any files in the "Select address book file" dialog, unless "All Files" is selected. By default LDIF (*.ldi, *.ldif) is selected. If 'all files' IS selected the file can be successfully imported. This occurs on both Mozilla 1.0.1 (compiled with MipsPro, both optimised and debug), and Mozilla 1.1 (compiled with gcc). This has been confirmed on 6.5.16, and 6.5.18.
*** This bug has been marked as a duplicate of 176847 ***