dofuspourlesnoobs.com: breakage #34584

Prerequisites

• This is NOT a YouTube, Facebook, Twitch, Spotify or a shortener/hosting site report. These sites MUST be reported by clicking their respective links.
• I read and understand the policy about what is a valid filter issue.
• I verified that this issue is not a duplicate. (Use this button to find out.). Comment in the old issue threads even when they are closed or even if you have a different problem.
• I did not remove any of the default filter lists, or I have verified that the issue was not caused by removing any of the default lists.
• I did not enable additional or non-default filter lists, or I have identified which specific stock list is causing the issue.
• I have disabled the Developer mode in uBO Lite's settings and the issue still persists.
• I have verified that the issue still exists after using the Optimal or Complete filtering mode.
• I have verified that the web browser's built-in content blocker/tracking protection, network wide/DNS blocking, or my VPN is not causing the issue.
• I have turned off all other extensions and the issue still persists.
• If this is about a breakage or detection, I have verified that it is caused by uBO Lite and isn't a site or browser issue.
• I have verified that the browser I am using is up to date with no pending updates.
• I did not answer truthfully to ALL the above checkboxes.

URL address of the web page

https://www.dofuspourlesnoobs.com/bandanarthrie.html

Category

breakage

Description

The clipboard copy button on my site stopped working, only in Optimal filtering mode (works fine in Basic mode).

I tested previous uBO Lite versions and confirmed this regression started with version 2026.825.1619, it was working fine in the version before that.

Console error on click:
NotAllowedError: Failed to execute 'writeText' on 'Clipboard': The Clipboard API has been blocked because of a permissions policy applied to the current document. See https://crbug.com/414348233 for more details.

The call stack traces back to ublock-filters.js (reflect / proxyApplyFn), which suggests a JavaScript Proxy is intercepting and replacing navigator.clipboard.writeText, rather than an actual native browser policy.

Note: I've since added a client-side fallback (document.execCommand) on my site, so the copy visually appears to still work for visitors. But the underlying Clipboard API call is still genuinely blocked and still throws the error above.

Additional observation (possible race condition): if I open DevTools and then reload the page with DevTools already open, the Clipboard API works normally. Without DevTools open at load time, it's blocked every time.

This affects every page on the site using this copy feature, not only the automatically-reported page.

On the attached screenshots, the clickable elements using the Clipboard API are circled in blue.

Browser name and version

Google Chrome
Version 153.0.8010.53 (Build officiel) (64 bits)

Other extensions used

none

Country

No response

Screenshot(s)

Screenshot(s)

Configuration

name: uBlock Origin Lite
version: 2026.920.1710
browser: Chrome 153 (win)
filtering:
 site: optimal
 default: optimal
permission: all
badge: 16
rules: 22887
rulesets:
 easylist
 easyprivacy
 fra-0
 pgl
 ublock-badware
 ublock-filters
 urlhaus-full
scripting:
 ublock-filters.main
 ublock-filters.isolated
 easyprivacy.main
 easyprivacy.isolated
 ublock-badware.main
 ublock-badware.isolated
 fra-0.main
 fra-0.isolated
 prevent-popup
 css-specific