Tumblr savior question

Anyone else using the Fire Fox 'Tumblr savior' extension? Is there some trick to get it to save my blacklist permanently or is it borked with FF18? I added stuff to my blacklist the first time, but now every time I re-start Fire Fox it reverts to the default settings. Talk about annoying! Just wondering what, if anything, I can do about this. I'd really love to keep using it but as-is it's a pain.