2039897 - [macOS][Standard User] Failed installation when attempting to install Firefox Nightly by double-clicking the .dmg mounted installer

Status: RESOLVED DUPLICATE of bug 2031817

(Firefox :: Installer, defect)

Description

[Bogdan Birsan-Caliman, DTE]

Attachment: Screenshot 2026-05-15 at 16.06.33.png

Found in

• Nightly 152.0a1

Affected versions

• Nightly 152.0a1
• Firefox 151.0b9
• Firefox 150.0.3

Tested platforms

• Affected platforms: macOS 14
• Unaffected platforms: Windows, Ubuntu

Preconditions

• test this on a macOS standard account

Steps to reproduce

1. Download and mount the Nightly .dmg installer file.
2. Double-click on the Firefox Nightly icon from the mounted image window.
3. Click Open on the "Firefox Nightly is an app downloaded from the internet" prompt.
4. Click Install in the "Finish installing Nightly?" prompt.
5. Enter Admin credentials when prompted and click Install Helper.

Expected result

• Firefox Nightly should be installed successfully, pinned to the dock and the browser should open.

Actual result

• After about approximately 20-30 seconds, the "Nightly installation failed." window is displayed.

Regression range
This does not seem to be a regression since the behaviour is present on all current versions. Please let me know if I should investigate further.

Additional notes

• When clicking on the OK button of the "Nightly installation failed." window, the browser runs in a temporary session.
• The issue does not occur when running the same steps while using an Admin user.

Comment 1

[Stephen A Pohl [:spohl]]

This is a duplicate of bug 2031817.