Each browser has its own remote debugging protocol, and the add-on translates from those "foreign" protocols back to Firefox's own built-in remote debugging protocol.

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 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.

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.

Firefox's new Scratchpad is different from Firefox's other JavaScript dev tools in that it is just, as the Mozilla Blog puts it, "a text editor that knows how to run JavaScript." Scratchpad gets ...