Firefox Profiler is now in Nightly!

17 December 2012 — San Francisco

As I said yesterday on Twitter, we shipped a profiler for Firefox DevTools. Here’s how it looks like:

Firefox released its built-in profiler (codename SPS) in version 16. However, to use it you had to install a special addon—developed by Benoit Girard—that exposed a visual interface for the profiler. And now we took that UI and integrated it into our new and shiny DevTools Toolbox.

Of course, this is a very early release. We already have a few bugs on file and I expect to see more of them coming. We will also be adding new features to help people make their websites and applications faster. But, in my personal opinion, everything is much better when you iterate based on user feedback. So please download the latest Nightly, try the profiler out and tell us what you think!

P.S. One common question is about the black-to-red gradient in the UI. Since we’re still working on our docs I’ll answer here: it’s red when we stop processing any events—meaning that the browser won’t be responding to user input and animations won’t be as smooth. So it’s a bad thing.