In response to 0.0.0.0 day, Firefox Nightly version 131 had introduced a new security measure: blocking access to 0.0.0.0/::/::ffff:0.0.0.0 addresses.
This change is currently live for Nightly users and will be gradually rolled out to all release users in the near future.
Before we implement this change across all Firefox releases, we would like to hear from our community. Are there any specific use cases where you rely on null IP addresses for internal browsing or other workflows? Your feedback will help us better understand how this update might impact you.
For those who would like to test this feature in release builds (starting with Firefox 131), you can enable the preference:
network.socket.ip_addr_any.disabled
We appreciate your input and look forward to hearing your thoughts. Thank you for helping us make Firefox safer for everyone!
