Mozilla has launched Firefox 77 with faster JavaScript debugging, optional permissions for extensions, and Pocket recommendations in the U.K.

Debug Chrome, Safari apps from Firefox with new add-on Mozilla lets you use Firefox as your IDE even when you're deploying to other browsers.

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.

Among those coming in Firefox 5, 6, 7 and 8 are a new debugger, an updated garbage collection process, JavaScript enhancements as well as a redesigned JIT compiler.