Mozilla has shipped Firefox 74 Beta and Developer Edition today, that will remove various non-standard features along with the TLS 1.0/1.1 support when the final version is out in March. In addition, enabling Feature Policy, originally planned for Firefox 73, will affect several APIs used in third-party
<iframe>s. So make sure to read through our site compatibility notes for Firefox 74 to get prepared today.
As a reminder, Firefox has moved to a faster 4-week release cycle. You’ll see the regular updates more frequently from now on. We’ll keep up with the latest changes and post compatibility notes as early as possible.