Thanks for pointing this out! I was using Containerise + Temp Containers. The "Default Container" section of Containerise has now replaced Temp Containers for me. In case anyone else is interested, here are my settings:
It leaves the containers behind when I use it so my container list is polluted with all of the temporary numbered containers. It stops me using it when it can’t cleanly handle itself…
Probably Firefox sync, but most likely the extension. I’ll use it again once it works.
I launch FF in a shell function that first calls BleachBit and calls it again when FF terminates. Not sure if that would help your case but it works for me. The reason I do this from a shell function is to redirect the output of FF console to a ramdisk just in case I needed it but did not have it prior to seeing something odd.