Affected versions

• 94.0a1 MSIX (20210920212918)
• 93.0b8 MSIX (20210920185952)
• 92.0b9 MSIX

Affected platforms

• Windows 10x64 Home S mode
• Windows 11 x64

Preconditions

• clean environment required to reproduce. No normal firefox installation.

Steps to reproduce

1. Install Firefox 93.0bx MSIX and open it.
2. Go to about:profiles and click Open Folder for Local Directory.

Expected result

• Firefox profile folder is opened.

Actual result

• Location is unavailable error is displayed.

Regression range

• Not a regression, reproducible with 92.0b9 as well.

Notes

• Attached a screen recording.
• Firefox is working as intended. Only the profile path is not right inside about:profiles. Going manually to C:\Users\user\AppData\Local\Packages\Mozilla.Firefox.Beta_gmpnhwe7bv608\LocalCache\Local\Mozilla\Firefox\Profiles\g7k3i1lk.default-beta the profile exists. Also to test it I deleted the google4 folder inside profile-> safebrowsing and clicked on update inside about:url-classifier->google4 and the folder was created as expected.

This is likely the same root cause as https://bugzilla.mozilla.org/show_bug.cgi?id=1730498

The bug remains active as new versions of Firefox (at least up to 132) are also affected by it. Also, about:support is affected by this bug in the same way (displaying a "Location is not available" error after clicking the "Open Folder" button).

(In reply to Alexandru Trif, Desktop Test Engineering [:atrif] from comment #0)

Steps to reproduce

1. Install Firefox 93.0bx MSIX and open it.
2. Go to about:profiles and click Open Folder for Local Directory.

Expected result

• Firefox profile folder is opened.

For the record, the Local Directory stores temporary files; the Root Directory stores the profile folder, as mentioned in this SUMO article:
https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles#w_manage-profiles-when-firefox-is-open
(quote) Note: The Root Directory stores user profile data such as bookmarks, passwords, and preference settings. The Local Directory stores the disk cache and other temporary data.