Exactly it is incorrect to jump to the conlusion that they are using a keylogger. I mean, they're loading a JS library that allows to handle keypress events; bu

Exactly it is incorrect to jump to the conlusion that they are using a keylogger. I mean, they're loading a JS library that allows to handle keypress events; but if you talk about a keylogger everyone assumes that they're stealing your keystrokes. What needs to be done is to navigate the site and typing a given char sequence on every page while logging the HTTP traffic, then do a search for that sequence to see if it appears in any request. That's the basic thing you could do to actually verify if there is a keylogger.