https://github.com/mozilla/mozilla-central/search?q=key_find
Add key_find to the list in https://github.com/ttaubert/customizable-shortcuts/blob/master/lib/prefs/actions.js
See if there's a different code for the '/' key, rather than the Ctrl-f shortcut
mozilla-central/browser/metro/base/content/browser.xul contains '/' as a shortcut, but mozilla-central/browser/base/content/browser.xul doesn't. Is metro
only for win8 metro?