The decision was made that the next version of Firebug (codenamed Firebug.next) would build on top of Firefox DevTools, and Firebug would be merged into the built-in tools.Īnd perhaps most importantly, we joined forces to build the best developer tools together, rather than compete with each other. Additionally, Firefox’s built-in developer tools have been gaining speed, so it made sense to base the next version of Firebug on these tools instead. The Firebug Working Group agreed they didn’t have enough resources to implement such a massive architectural change. Unfortunately, Firebug wasn’t designed with multiprocess in mind, and making it work in this new scenario would have required an extremely difficult and costly rewrite.

With multiprocess architecture, if a website crashes, it doesn’t also crash the whole browser.

Electrolysis’s multiprocess architecture makes it possible for Firefox to run its user interface (things like the address bar, the tabs and menus) in one process while the content (websites) runs in other processes. The reason for this huge change is Electrolysis, Mozilla’s project name for a redesign of Firefox architecture to improve responsiveness, stability, and security. As you might have heard already, Firebug has been discontinued as a separate Firefox add-on.

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