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

Sometimes the text content of the element does not contain the scheme (http://) and when the scriplet is applied, it incorrectly replaces the href to the (non-existent) page at the current site itself.

Typically the tracking is applied to external URLs only, so the internal link is almost always the wrong one.

A specific URL where the issue occurs.

https://addons.mozilla.org/en-US/firefox/addon/foxy-gestures/

Steps to Reproduce

1. Visit any page of a site with href-sanitizer applied that also has a link without the scheme in the text content of <a> (for example the above specified URL)
2. Observe that the modified href is not the correct link.

Expected behavior

On the webpage
https://site1.com/pages/page1
the link
<a href="https://trackersite.com/tracking-id">www.site2.com</a>
should be replaced by
<a href="https://www.site2.com/">www.site2.com<a>

Actual behavior

On the webpage
https://site1.com/pages/page1
the link
<a href="https://trackersite.com/tracking-id">www.site2.com</a>
is replaced by
<a href="https://site1.com/pages/www.site2.com">www.site2.com</a>

uBO version

1.64.1b1

Browser name and version

Mozilla Firefox 139.0.1

Operating System and version

Linux 6.14