Together, We Build a Better Web

A community-driven Web developer engagement initiative focused on the backward compatibility and regressions in Firefox. Documents, latest updates & more.

Latest Blog Post

Mozilla has shipped Firefox 69 Beta and Developer Edition. From the camera and mic access to Flash Player support, we have seen various changes as usual. Check out our Firefox 69 compatibility notes to get prepared for the final version coming in early September.

Site news

  • We have moved from .com to .dev domain, so our sites is now on FxSiteCompat.dev! It shows our intent to serve developers better.
  • We have restarted quasi-real-time coverage of Firefox Nightly. Changes are documented as soon as they’re landed to the Nightly channel.
  • And now we have more than 800 notes!

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