Hi, I'm sorry this happened. It's definitely not a bug in our code, though. Something is wiping Firefox's indexeddb storage - it's pretty much impossible for us to accidentally write code that would suddenly just wipe the entire contents of the storage and then delete the entire OneTab database after that. Please check that you don't accidentally click "yes" to a Firefox "Refresh" after a Firefox update, since that would delete extension data without asking you. Also, privacy cleaner software will wipe Firefox data too. It could also be a disk write error.