Hello. Do you have the option to ask Firefox to check for updates? It is under Firefox Updates on the General page of Settings. Evidently, there is an issue with LastPass. I would check its page on the add-ons site. If it isn't listed there, you will have to find its website. The article linked below may help with missing data. https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update