I've no idea what's going on with your setup.
If FFF failed to read any cache files, it would report them ("Cache file %s failed to load, skipping."%path) right before "Read 9897 entries".
I used FFF with Firefox on Unintended-Consequences myself just this morning.
OS differences maybe? Are you using Calibre from a non-official (ie, not calibre-ebook.com) source? Or FFF from somewhere other than this thread?
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