Mozilla today announced the Firefox OS App Manager, a new developer tool that will ship with Firefox 26. It is designed to help developers build and debug Firefox OS apps, either in the Simulator ...

Firefox 15 will offer web developers a couple of cool new tools when it arrives later this year, including a very handy new "Responsive Mode" for testing your responsive websites.

Mozilla is still keeping up with their promise for rapid releases of their Firefox web browser, and it actually just seems like yesterday when the company released Firefox 15 to the public ...

The Firefox Web developer tools are already used by millions of Web developers for creating Web pages, and now the App Manager extends these capabilities to mobile app creation, with the same ...

As promised, Mozilla today launched Firefox Developer Edition, which it is calling “the first browser created specifically for developers.” The company wants to solve a very big problem ...

Mozilla is planning to add several new web-development tools to Firefox in 2012. Eventually these built-in tools may even be enough to replace the popular Firebug add-on for most developers.

We show to you how you can identify what font a web page on Chrome, Edge and Firefox is using through Inspect Element in Developer Tools.