Restoring Firefox Mobile Device Settings

My desktop Firefox had been running very very slowly and freezing up, so I decided to download and install A new copy of Firefox. I did not realize that doing so was going to delete all my bookmarks and settings and everything. When it did, I was devastated. At first, I thought maybe there was a chance I could get it back because there was a folder on my desktop that said old Firefox data but there is nothing in there that was useful so I’m wondering why it’s even automatically saved and why what was in there? It saved if it’s not helpful for recovering Firefox. So I went to my mobile device and set a sync to sync my mobile device with the desktop device. Only the sink for some reason ran in the wrong direction instead of the mobile device, sending all the information to the desktop when I press sync on my mobile device, it took all the stuff from the desktop to my mobile device and now I’ve lost everything on my mobile device as well. I am livid. Please tell me there’s a way that I can retrieve all my bookmarks and my passwords from my mobile Firefox and then how I can get that information onto my Firefox desktop.