Using Xpath with Stylish?

Factual Questions
1

There are some webpages that I’d like to modify client-side with a user style, which is what Stylish does. Unfortunately, CSS doesn’t have the selector I need, but Xpath would.

Is there any way to do this with Stylish or a similar addon? Or would I have to resort to JavaScript and Greasemonkey?

2

Nevermind, found it after a longer search. Customize Your Web (for Firefox) can do this.