1966579 - Nightly is unusable when launched with a new profile

Status: VERIFIED FIXED

(Toolkit :: Startup and Profile System, defect)

Description

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

Attachment: nightly.mp4

Found in

• 140.0a1 (2025-05-14)

Affected versions

• 140.0a1

Tested platforms

• Affected platforms: macOS 13/14, Windows 11
• Unaffected platforms: Ubuntu

Steps to reproduce

1. Install or update to the latest Nightly build
2. Create a new profile via Profile Manager or from about:profile
3. Launch the newly created profile
4. Attempt to interact with the browser

Expected result

• The browser should be functional and responsive

Actual result

• The browser appears grayed out and is unasable - the window is unresponsive to input

Regression range

• Will search for a regression ASAP

Additional notes

• Pressing the ESC key dismisses the gray overlay and restores functionality
• See the attached video
• Not reproducing if using an old profile

Comment 1

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

I have performed the regression range and Mozregression points to bug 1963168.

Comment 2

[Donal Meehan [:dmeehan]]

Setting Fx140 to fixed, since the regressor Bug 1963168 was backed out of central

Comment 3

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

I can confirm that the issue is no longer reproducible using Firefox Nightly 140.0a1 (2025-05-15), on macOS 14 and Windows 11, after the fix for bug 1963168 was backed out.

Comment 4

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

Verified as fixed using Firefox 140.0b2 and Firefox Nightly 141.0a1 (2025-05-28), on macOS 14 and Windows 11. The browser is responsive when launched with a new profile.