This is an amazing extension, and Work Sans has been my favorite font to use on every website. However, I would give it 5 stars if there was an option to add fonts.

Awesome add-on, but I can't find the source code on this page

使用是很不错，很丝滑。。能否增加一些中文字体，或者说让用户选择一些本地的字体？

So far, so good and does the job for me.