I have lost access to my logins (and passwords), I now have created a profile but cannot sync them.

I'm the only User of my Firefox browser and I noticed Firefox stopped filling out logins automatically when browsing on the internet. I was unable to access my logins in the preference menu under "manage saved passwords" as the list was empty. At first I didn't understand why. It seems that I hadn't created a "Profile" and was still using Firefox with my main account and as such was unable to access any previously synced data of that nature (under the updated Firefox configuration) I have now created a Profile but I don't know how to sync with my main account's login data list... I have read that I can locate a Profile folder to load previous data, but I'd rather find the main account folder if that's even possible, because the Profile folder hasn't synced any logins if I understand correctly.

Cheers for even reading this far ;)