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Maniphest T401554

Constantly getting logged out across projects on Firefox with 'Strict Enhanced Tracking Protection' enabled
Open, Needs TriagePublicBUG REPORT
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Description

Steps to replicate the issue (include links if applicable):

  • Open Firefox.
  • Enabled "Enhanced Tracking Protection" and set it to "Strict".
  • Log into Wiktionary.
  • Log into Wikibooks.
  • Log into Wikipedia.
  • Log into MW.org.

What happens?:
After some period of time, I am logged out everywhere.

What should have happened instead?:
I shouldn't have been logged out.

Other information (browser name/version, screenshots, etc.):
Firefox 141.0.3

Related Objects

Event Timeline

Redmin created this task.Aug 10 2025, 5:56 PM
Restricted Application added a project: MediaWiki-Platform-Team. · View Herald TranscriptAug 10 2025, 5:56 PM
Restricted Application added a subscriber: Aklapper. · View Herald Transcript
Redmin added a subscriber: Grey_ghost.EditedAug 10 2025, 5:57 PM

Also reported:

In T348388#11072365, @Grey_ghost wrote:

When I log in on Wikipedia or Wikisource on my computer with Firefox, I'm only logged in to Wikipedia or Wikisource. Before when I logged in, as recently as April, I was logged in to all wiki projects when I logged in with Firefox on my computer (Wikipedia, Wikisource, Wikidata, Wikimedia Commons, etc). But when I log in with Microsoft Edge, I'm logged in on all wiki projects at the same time. Another user had the same problem with Firefox but managed to log in on all projects with Chrome. It has pointed out to me that this is because of SUL3. Would you please fix this?

EDIT: I can reproduce this, too.

Redmin updated the task description. (Show Details)Aug 10 2025, 5:58 PM
Tgr mentioned this in T348388: SUL3: Use a dedicated domain for login and account creation.Aug 11 2025, 10:18 AM
Johannnes89 subscribed.Aug 11 2025, 10:48 AM
• DAlangi_WMF subscribed.Aug 11 2025, 12:59 PM
JTweed-WMF moved this task from Inbox, needs triage to Next (DO NOT USE) on the MediaWiki-Platform-Team board.Aug 11 2025, 2:37 PM
matmarex renamed this task from Constantly getting logged out across projects on Firefox with 'Enhanced Tracking Protection' enabled to Constantly getting logged out across projects on Firefox with 'Strict Enhanced Tracking Protection' enabled.Aug 11 2025, 2:52 PM
Redmin moved this task from Backlog to Central session, SSO (autologin) and centralauthtoken on the MediaWiki-extensions-CentralAuth board.Aug 14 2025, 3:32 AM
ReaperDawn subscribed.Aug 15 2025, 6:58 AM
OWresch-WMF edited projects, added: MediaWiki-Platform-Team (Kanban Board); removed: MediaWiki-Platform-Team.Nov 21 2025, 11:39 AM
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