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Re:Firefox 50.0 by baby on Tuesday November 15, 2016 @05:59PM (#12963109)
Ctrl+shift+P then type "key bindings user"
Re:Firefox 50.0 by spartanatreyu on Tuesday November 15, 2016 @06:52PM (#12963426)
Cmd+Shift+P for MacOS.

Also Preferences -> Key Bindings works too but I'd encourage everyone to get used to the command palette for all sorts of commands like Set Syntax and Package Control