mozilla-mobile/firefox-ios

[Intermittent] - Incorrect behavior when closing older tabs

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#31809 opened on Jan 23, 2026

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Contributor OKGood first issue

Description

Steps to Reproduce

  1. Open Firefox on iOS.
  2. Open several tabs in tab tray.
  3. Go to device settings and set the date forward with a week and a day and also change the time one hour later.
  4. Return to Firefox tab tray and tap on the trashcan.
  5. Select close older tabs-->one week ago.

Expected Result All the tabs are closed and the tab tray is empty (except for a homepage tab).

Actual Result One (or sometimes more) of the tabs is NOT closed, so in the tab tray you will see that tab and the homepage tab.

A couple of times we noticed that the oldest tab is the one that doesn’t close, but we don’t have a clear pattern.

Device & Build Information Device: iPhone 17 Pro(iOS 26.0), iPad mini (26.3) Build version: v9000 (67255) First seen:

:information_source: Reference Person

+@Foxbolts+

┆Issue is synchronized with this Jira Bug

Contributor guide

Tech stack
swiftios
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Swift experienceiOS developmentFamiliarity with Firefox iOS tab tray
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Look into the tab closing logic in Firefox iOS, specifically the 'close older tabs' feature. Investigate how the app handles date/time changes, possibly in TabManager.swift or TabTrayViewController.swift. Check if there's a bug in the date comparison that causes one tab to remain. Consider adding unit tests for the date related filtering logic.