Found in

• Firefox 106.0b4

Affected versions

• Firefox Nightly 107.0a1
• Firefox 106.0b4

Tested platforms

• Affected platforms: Windows 10x64, macOS 10.12.6, Ubuntu 22
• Unaffected platforms: -

Steps to reproduce

1. Launch Firefox with a new profile
2. Open a few tabs for history purposes
3. Close Firefox
4. Open Firefox with the same profile
5. Focus the Firefox View tab
6. Go to the other open tab to see the "restore previous session" message
7. Click on "Show me how" button and restore the previous session

Expected result

• Firefox closes when restoring the previous session from the "Show me how" button after the Firefox View tab was focused

Actual result

• The previous session should be restored without any issues.

Regression range

• Most likely not a regression since issue is reproducible with Nightly 105.0a1

Additional notes

• See the attached screen recording
• Issue is not reproducible if the Firefox View tab was not selected before

Niklas, can you take a look at this?

https://hg.mozilla.org/mozilla-central/rev/c91bf964f30f

Comment on attachment 9296413 [details]
Bug 1792441 - Keep window open when restoring with hidden tabs. r=gijs!,dao!

Beta/Release Uplift Approval Request

• User impact if declined: Windows closing willy-nilly when they shouldn't, manual session restore not working correctly
• Is this code covered by automated tests?: Yes
• Has the fix been verified in Nightly?: No
• Needs manual test from QE?: Yes
• If yes, steps to reproduce: See comment 0
• List of other uplifts needed: No
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Straightforward expansion of previous JS-only fix, has automated test
• String changes made/needed: No
• Is Android affected?: No

Comment on attachment 9296413 [details]
Bug 1792441 - Keep window open when restoring with hidden tabs. r=gijs!,dao!

Approved for 106.0b7, thanks.

https://hg.mozilla.org/releases/mozilla-beta/rev/3f068e96c8a0

Verified that the issue is fixed on Firefox 106.0b7 and 107.0a1. Tests were performed on macOS 13, Windows 11 and Ubuntu 22.04.

Perfherder has detected a talos performance improvement from either this or Bug 1792546. Do you believe this patch could have caused the following improvement?

== Change summary for alert #35617 (as of Tue, 04 Oct 2022 17:43:26 GMT) ==

Improvements:

For up to date results, see: https://treeherder.mozilla.org/perfherder/alerts?id=35617

It doesn't seem likely that this patch caused the performance improvement