2019955 - Open tabs are not synced between devices.

Status: NEW

(Firefox Enterprise :: General, defect)

Description

[lburuian]

Found in

• Firefox Enterprise v. 149.0a1 (2026-02-21)

Tested platforms

• Affected platforms: All

Preconditions

• Ensure 2 devices are available for this test: Device 1 and Device 2.
• Ensure Open tabs is checked in the Sync settings for the account.

Steps to reproduce

1. On device 1, log into Firefox Enterprise and open a few tabs.
2. Perform a manual sync from about:preferences#sync.
3. On device 2, log in with the same account.
4. Perform a manual sync from about:preferences#sync.

Expected result

• The open tabs from device 1 are synced on device 2.
• They are displayed in "Tabs from other devices section" of Firefox View, Sidebar, or Toolbar (if enabled)

Actual result

• The devices are not synced, not displayed in "Tabs from other devices", and the open tabs are not available.

Additional notes

• “Try Firefox for mobile” and “Connect another device” option is displayed in "Tabs from other devices" section, which redirects the user to FxA “Connect another device” functionality.

Comment 1

[Florian Dieminger [:fiji]]

This is resolved on staging. Can you verify?

Comment 2

[lburuian]

Attachment: Open tabs - console vs browser

Hi Florian,
I checked this in staging, using Firefox Enterprise 150.0a1 (2026-02-27), and the devices, together with the open tabs, are now synced.

However, while in the console I have only 2 active sessions (no idle sessions), on the devices tab in the browser I have 5 entries (connected devices).
The first two are the correct ones (out of which one is the active session from the device I am looking at and maybe it should not be displayed, as it is not a session on OTHER device), where my open tabs are also present.
The other three seem to be older sessions that somehow got stuck.
At first I thought they might be idle sessions, but that does not seem to be the case.

Please take a look when you get a chance and let me know your thoughts on this.
Thank you.

LE: Eventually the active session from the specific browser instance I am actively looking at has dissapeared. So, on either device, only the session from the different device was displayed. The 3 "ghost" one remain still.

Signing out from one session closed my open active session fro the console, but sync does not remove the inactive device drom the "Tabs from other devices" section.