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 70 Beta and Developer Edition. From the FTP deprecation to MathML 4 support, we have seen various changes as usual. Check out our Firefox 70 compatibility notes to get prepared for the final version coming in late October.

Aside from site compatibility changes, the browser’s location bar now shows a broken padlock for insecure sites while removing the EV SSL cert indicator. Remember, you can always get trusted certificates from Let’s Encrypt for free (but you’re highly encouraged to give them some donation.)

We’ll start covering Firefox 71 Nightly today. Install our Site Compatibility Tools extension to your Firefox and be the first to know about important changes!

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