A few years ago, I wrote an extension for Firefox called Font Finder. It was a basic utility that let you highlight any text in a website and immediately get detailed font information such as family, leading, line-height, etc. It’s been downloaded half a million times and had great reviews.
I stopped using Firefox a long time ago and so when it came to update the app a developer named Andy Portmen asked if he could continue to work on the extension. He published an update in July which bought the extension up-to-date with the latest version of Firefox and Font Finder has now been featured by Mozilla!
If you’re a designer that uses Firefox, be sure to check it out. My thanks to Andy for keeping Font Finder alive for those users who have found it useful over the years.