User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:49.0) Gecko/20100101
Firefox/49.0
Build Identifier: 

After assigning a different keyboard shortcut to "Activate Application Menu
Widget", such as Meta + R, it is forgotten after a reboot.
Additionally, multiple "Activate Application Menu Widget" entries without
keyboard shortcut assigned appear like so: http://i.imgur.com/L8Z2s8P.png

Reproducible: Always

Steps to Reproduce:
1. Assign custom keyboard shortcut to "Activate Application Menu Widget"
2. Reboot

Actual Results:  
Custom keyboard shortcut is forgotten.

Expected Results:  
Custom keyboard shortcut is remembered.