In brief, Firefox did not restore my tabs after a crash. I went to a computer to see if I could view synced tabs from the phone and none of them were there. What the heck happened to all my tabs and how do I recover them without trying to manually go through my entire browsing history (which would take hours)?

Update: Attempting to recover my tabs from my history is not working. The viewable history on my phone is only showing stuff from the last 24 hours or so. When viewing my history on a computer, it is not showing history older than about six months. This is extremely frustrating and alarming. I am entirely reconsidering using Firefox at all. Losing over a year's worth of tabs is unacceptable. Any help is greatly appreciated.