ya know.....it never occured to me to really track down the json file. Even though i totally know firefox really loves making use of them. Even had a sanitize script at one point that would kill any session on my work computer nightly and scrub my history without logging me out of sync account at a previous job.

I dont setup a new machine all that often that I care too much. I figured it was a misconfigured cloud DB point, that at best I could get Mozilla to clean up and let me re-sync, but even then didnt bother to open a ticket.