Firefox for Android doesn't save tabs anymore why is this happening?

I'm using a Samsung Galaxy Media Player 5.0. Up until about a week or two ago I could pull up a tab or more on Firefox and leave the program but not actually close out of it or clear it from memory and come back hours later with no access to a Wifi network and be able to read those tabs, provided I didn't refresh or navigate away from those tabs.

Now with this issue Firefox tries to load the tab like it did in the past but eventually it will just close all the other tabs and open the "Getting Started" page even when I'm hooked up to a Wifi network and I can leave the program for a little as 10-30 minutes have lose all my tab regardless of connection status.

I usually use Firefox to read individual chapters of several Fanfictions from