WhatFont is an extension for Chrome that tells you which fonts have been used on the site and its attributes. With this extension, you could inspect web fonts by just hovering on them. It is that simple and elegant. It also detects the services used for serving the web fonts. It supports Typekit and Google Font API.
[advt]The WhatFont button appears when it’s installed. Click on the button and mouse over any font to find out which one it is. You can right-click on the web page and the extension adds a small box that tells you which font family the font is from, what font size has been used, the weight and the line height. It can identify and give complete details of all fonts used anywhere on a single page of a website. The extension does not identify fonts used in images.