Worked fine for years but suddenly stopped doing what it is supposed to. Opened FF and last session did not load. Go to load session manually and all saves have disappeared except for one from three months ago. Won't import files. Won't export files. Won't autosave. Manual save works, mostly, but consistently deletes all but last save. Developer obviously doesn't give a crap because this issue has been going on for a while and he/she hasn't responded to any of the many reports, yet can and will respond to random, non-extension breaking things.

Useless.