EDIT: after installing the fixed XPI, I have to sadly report that all data has gone. All my carefully-managed containerized life was wiped clean. Heads should roll.

Complete shambles. And the worst thing is, I suspect it's all a plot to have more people opt-in to the shitty telemetry. Otherwise, why not push an update through the usual channels? Had it been a security-related fix, would have they used "studies"? I bet not.