This is a useful extension to speed up your design workflow. It's free. With it, you can analyze fonts from websites and bookmarks, and get the fonts' names, type, and CSS properties, all in real time. It's a tool that is very helpful for designers.

You can easily identify the fonts used in a webpage or a bookmark. 

The trial version is free, so you can install it on your macOS or Windows computer and try it out.

Fonts Ninja is one of the most powerful font analyzers in the world.