You should consider making this into a browser extension. For this kind of script it's rather easy and is way easier for users to install. For an example with a very similar configuration (array of strings) that is a configurable extension instead, checkout my WaPo Metal Taglines greasemonkey script[0] and extension[1]
[0] https://greasyfork.org/en/scripts/27767-wapo-metal-taglines/...
[1] https://github.com/dschep/metal-wapo