Contribution to the project is much appreciated.
If you have found a bug in the extension's current features or if you have an idea for a new feature, then create an issue in this repository. If it's a bug, then make sure to include a good explanation, and if possible, upload some images to make debugging easier.
If you are a programmer with knowledge in chrome extensions or web-developing in general, then you are more than welcome to work on the extension and submitting a PR. If you are going to implement a new feature, then make sure to create an issue first so that we can discuss the implementation.
Custom-Highlight uses the library pickr (v1.7.1) by Simonwep as it's color-picker.