Well sorry about that but yeaaah it happens and you are not alone. I even saved a few drawing for later here and came back to do quick touch ups before finally uploading them just to find the saved files are empty. You have no idea how furious I was...
*honestly just wanted to rant*
I'm sorry to tell you that your drawing is indeed lost forever TnT just remember to save constantly next time :'D
Firefox crashed in the middle of my drawing and I'm afraid it's lost. I'm so upset. I worked so hard on it for about 4 hours and was halfway finished. Do our drawings get automatically saved as we are working on them? Is there anyway to retrieve my drawing?