Firefox auto-imprt breaks if profile name does not end with .default, with firefox profile name like 4r3pvu9s.default-1478290660929 this happens:

./buku.py --ai
Traceback (most recent call last):
File "./buku.py", line 4338, in
main()
File "./buku.py", line 4288, in main
bdb.auto_import_from_browser()
File "./buku.py", line 2175, in auto_import_from_browser
profile = get_firefox_profile_name(DEFAULT_FF_FOLDER)
File "./buku.py", line 2571, in get_firefox_profile_name
profile = [name[:-8] for name in names if name.endswith('.default')][0]
IndexError: list index out of range

I tested many profile names and all that does not end with .default return error
so the solution could be reading profile names from profiles.ini in mozilla profile folder.
I did tests only on arch linux, dont know for other distros