I mean on the encrypt side, not the decrypt side. When I try to put text into a react form, react doesn't pick it up - it still uses the original text in the input form. I will definitely look at that code though, thanks!
I won't pretend to be an expert, but very vaguely, if I know anything about react: you would have to modify the local state of the form (if it's possible at all by a 3rd party in fb frontend code) and react/flux will modify the dom for you. If you go more directly (on the DOM for example) you will get overwritten by the current state as soon as react re-renders
sorry I'm not @lettergram, so I cannot really help you with his code; I never tried to inject code into a facebook page, but I can imagine that especially after minification it's going to be a pain to do