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.
• 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.
• using a new, unmodified browser profile.

Description

Hi!
New tabs opened from a site that allows popups open correctly. However, they are immediately closed after navigating to a site that blocks popups (no-popups: true) in the same tab that originally opened them.

The reproduction steps are intentionally simplified to trigger the issue quickly. In real-world scenarios, this behavior may lead to important tabs being closed unexpectedly, potentially resulting in data loss or user confusion.

There are existing reports about tabs being closed automatically when using no-popups: true, however, none of them describe this specific scenario, where tabs open correctly but are closed only after the original tab navigates to another site.

A specific URL where the issue occurs.

https://www.bbc.com/

Steps to Reproduce

1. Add the following rule to My Rules: no-popups: cnn.com true
2. Go to BBC.
3. Middle-click Sign In button to open it in a new tab (Right-click -> opening in new tab works as well) -> The new tab is opened correctly.
4. In the original tab (where BBC is open), navigate to CNN (do not use the newly opened tab).

Expected behavior

Opened tab should remain open because is was created from BBC, a site that allows popups.

Actual behavior

The opened tab is immediately closed.

Note: If a few seconds pass before navigating to CNN, the tabs remain open, as expected.

Configuration

uBlock Origin: 1.69.0
Chromium: 145
filterset (summary):
 network: 467978
 cosmetic: 121195
 scriptlet: 40864
 html: 0
listset (total-discarded, last-updated):
 added:
  https://filters.adtidy.org/extension/ublock/filters/3.txt: 136738-219, 4d.22h.20m
  https://raw.githubusercontent.com/DandelionSprout/adfilt/master/LegitimateURLShortener.txt: 2944-6, 14m
  https://raw.githubusercontent.com/Spam404/lists/master/adblock-list.txt: 7251-0, 16h.54m
  https://secure.fanboy.co.nz/fanboy-annoyance_ubo.txt: 92131-57929, 6d.13h.19m
  adguard-spyware-url: 2437-235, 2d.6m
  curben-phishing: 160551-1, 14m
  dpollock-0: 12110-575, 2d.13h.5m
  fanboy-cookiemonster: 45430-97, 2d.21h.18m
  fanboy-social: 17356-17346, 2d.20h.5m
  fanboy-thirdparty_social: 69-0, 6d.13h.19m
  ublock-cookies-easylist: 5496-40, 6d.23h.23m
 default:
  user-filters: 488-0, never
  easylist: 94419-529, 14m Δ
  easyprivacy: 55403-25054, 14m Δ
  plowe-0: 3504-696, 2d.13h.5m
  spa-0: 3755-17, 20h.52m
  spa-1: 6661-250, 4d.22h.20m
  ublock-badware: 10608-104, 14m Δ
  ublock-filters: 44140-305, 14m Δ
  ublock-privacy: 3633-625, 14m Δ
  ublock-quick-fixes: 446-0, 14m Δ
  ublock-unbreak: 2731-100, 14m Δ
  urlhaus-1: 26010-7, 14m
filterset (user): [array of 482 redacted]
trustedset:
 added: [array of 6 redacted]
switchRuleset:
 added: [array of 158 redacted]
hostRuleset:
 added: [array of 269 redacted]
userSettings:
 advancedUserEnabled: true
 showIconBadge: false
 suspendUntilListsAreLoaded: true
 userFiltersTrusted: true
hiddenSettings:
 trustedListPrefixes: ublock- user-
supportStats:
 allReadyAfter: 449 ms (selfie)
 maxAssetCacheWait: 120 ms
 cacheBackend: indexedDB