Thanks for your rating. It's great to hear that you like the add-on. 😀

Changing the style/emojis of arbitrary sites is not really in the scope of this project. In the options of the add-on you can choose the size and style of emojis that the picker itself uses, but how it is displayed on the website itself depends on the website, browser and your operating system.

If you have further issues or questions, feel free to ask or suggest a feature by opening an issue on https://github.com/rugk/awesome-emoji-picker/issues/. Thanks.