The mappings list is empty. The dropdown boxes in the Swipe options are empty. The dropdowns in the Advanced options are empty (except for Key gestures).
Restoring my backed up options does nothing. (I backed up before the update)
Edit:
This is on Firefox 50.1.0 32-bit.
I checked on Firefox ESR 45.4.0 64-bit and it works fine.
Edit 2:
I was able to change the options and configure on Firefox ESR, and then save the config, and those settings carried over to Firefox 51.
The mappings list is empty. The dropdown boxes in the Swipe options are empty. The dropdowns in the Advanced options are empty (except for Key gestures). Restoring my backed up options does nothing. (I backed up before the update)
Edit: This is on Firefox 50.1.0 32-bit. I checked on Firefox ESR 45.4.0 64-bit and it works fine. Edit 2: I was able to change the options and configure on Firefox ESR, and then save the config, and those settings carried over to Firefox 51.