Hi

We recently had another question about this issue with the Facebook Container extension, so you will have to contact the creator of the extension for support.

• /questions/1325536 App Tabs not saving on exit

I am not sure this is the issue. It only happens to one pinned tab, on one of my Firefox windows. I have 3 windows that open when I start Firefox, and every other tab and pinned tab are there and behave as they should.

Edit: I misunderstood which extension you meant. I'll have a closer look at that thread.