[SOLVED] Firefox passwords lost after update to 60 Quantum

Hello,
The title says it all. A week ago my Firefox got updated from version 52 to 60, and now the dozens of password I had in store (including the one for this forum, which I've had to reset) are totally gone
. Remarkably, the Master Password that I had set is gone too, and the option is unchecked.
Has anybody else suffered this bug? What shall I do to recover my old passwords?
The title says it all. A week ago my Firefox got updated from version 52 to 60, and now the dozens of password I had in store (including the one for this forum, which I've had to reset) are totally gone

Has anybody else suffered this bug? What shall I do to recover my old passwords?
