I\'m not asking how to tell footnotes how to do this - I\'m using this line in the initializers/footnotes.rb
file:
Footnotes::Filter.prefix = \'txmt
subl-handler works by interpreting txmt urls, and forwarding them to Sublime. If you, like me, have TextMate or any other application currently responding to txmt, then subl-handler will never run, and won't be able to help you. If that's the case, you need a utility like RCDefaultApp to change the default handler for txmt urls from TextMate (or whatever it currently is) to subl-handler.
So, the full instructions (per here) are: