Literally none of your statements is true:
sure it’s possible with jquery.
jQuery can’t attach capturing listeners. See e.g.:
xray vision is concerning content and background script communication
Xray is a thin, in-process isolation layer:
using it between content and background script wouldn’t even work because they live in different processes.
it’s not inline scripting, and so on.
As far as CSP is concered, it is.
i’m out of this conversation.
Well, suit yourself 