@nurdok - this is pretty clever. I was trying to hook the Goodreads API, but found out they’ve deprecated it somewhat recently. This is a good workaround for a quick capture.
I hacked your plugin a little and added support for the book description and series info off the page:
Caveat: Since the full description is under a unique ID, the tool does not work when the description is unfolded (ie: after the “…more” link is pressed)
I’ve never done a pull request before, but I could try to share if interested. It didn’t take too much to add these, though.