So yes, Firefox Developer Edition is much more than just Firefox with a few tools taped to the side. This is a developer’s dream browser, or at least it’s the first version of what Mozilla ...

Specifically, Web devs will be able to use Firefox's JavaScript debugger, DOM inspector, and CSS editor with Firefox, Chrome, and Safari.

Perhaps the biggest change in Firefox 15 is that it ships with a debugger that developers can use to find issues with their JavaScript code. The debugger is available via the Web Developer menu.

Mozilla began migrating Firebug features to the built-in Firefox debugging tools in 2016. Core Firefox developer tools include a page inspector, web console, JavaScript debugger, and network monitor.

Mozilla today launched Firefox 77 for Windows, Mac, and Linux. Firefox 77 includes faster JavaScript debugging, optional permissions for extensions, and Pocket recommendations in the U.K.

Debugger.html currently debugs Firefox, connecting via the Firefox Remote Debugging Protocol. It also can connect in an experimental fashion to the Chrome browser to debug Chrome tabs, and to Node ...

Firebug lets you drill into any aspect of the current webpage, including markup, stylesheets, JavaScript, and more. The page that appears in the browser window is usually a combination of HTML ...