Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

The “uBlock filters – Privacy” list contains the following filter, intended to prevent access to the unspecified address ::/128.

*$all,ipaddress=::,domain=~0.0.0.0|~127.0.0.1|~[::1]|~[::]|~local|~localhost

However, IPv4-mapped addresses ::ffff:0:0/96 also happen to be blocked by this filter.

A specific URL where the issue occurs.

https://[::ffff:14cd:f3a6]/

Steps to Reproduce

1. Enable the “uBlock filters – Privacy” list or manually add said filter.
2. Visit https://[::ffff:14cd:f3a6]/.

Expected behavior

The page loads. The browser may warn about the certificate being invalid.

Actual behavior

The page is blocked by this extension.

uBO version

1.59.1rc1

Browser name and version

Firefox 131.0b7

Operating System and version

macOS 14.6.1