Font Inspector is a simple add-on for Firefox, Chrome, Opera, Safari, and other browsers. It helps you with the task of investigating the fonts used in a web page. It can be useful for people who have to work with many HTML files. 

Fon Inspector is very simple and easy to use, with a user-friendly interface. You can select an element and get all the fonts in a popup. It provides you with a lot of information about the font, such as its name, style, color, size, etc. It also has information about the current tab, such as id, width, height, title, and URL.