When trying to run xsane from the terminal, I get the following error message:
[snapscan] Cannot open firmware file /usr/share/sane/snapscan/your-firmwarefile.bin.
[snapscan] Edit the firmware file entry in snapscan.conf.
I guess a good reason for that is that neither the file mentioned nor the folder "snapscan" exists.

What's snapscan? I couldn't install it (package not found), so where to I get that darn file from?