mozilla/butter — pull request #1507 by cadecairos (2013-02-19 21:17:00+00:00)
Title: [#2831] prevent accidental navigation on delete/backspace

https://webmademovies.lighthouseapp.com/projects/65733-popcorn-maker/tickets/2831-delete-key-disabled-except-for-things-that-have-focus#ticket-2831-4