ccleaner cleaning bookmarks, history and last session upon firefox start up?

i didn't tell it to, its set to only do it on prompt and only the cache and history are suppose to be cleaned. In fact i usually only get the prompt to clean it when I close firefox. but this time i opened FF and the ccleaner prompt popped up and showed it cleaning as firefox loaded. My bookmarks are gone, my last session is gone and all my history is gone. How does this happen? I'm so grateful it didn't remove my saved passwords, that might have been even more disasterous.

does anybody know a way for me to get at least my last session data and bookmark data back?

thanx in advance

ccleaner doesn't have any cleaning rule to delete bookmark and doesn't have any option to run when ff start

if you're lucky, you can restore the bookmark from bookmark backup which ff created daily

press CTRL+SHIFT+B > Import and Backup > Restore

Do you have monitoring enabled in Ccleaner?