Font Finder

Font Finder is a web browser extension for Firefox, Chrome and Safari, that lets you find out the CSS information of any text on a webpage for your own projects (or just out of curiosity). Just highlight any text element, right click, and choose Font Finder. An alert box will display styling information including font-size, font-family, color (in both hex and RGB), line height, letter spacing, and more. In addition, not only does it inform you of the CSS font stack, but it also tells you exactly which font from the stack is currently being rendered.