1858165 - Cache data is not deleted after ending a private session in permanent browsing mode

Status: NEW

(Firefox :: Private Browsing, defect, P3)

Description

[Simona Badau, Desktop QA]

Found in

• Nightly 120.0a1

Affected versions

• Nightly 120.0a1

Tested platforms

• Affected platforms: Windows 11, mac 11.7 Ubuntu 22.04

Preconditions

• In Settings - set Nightly to Permanent Browsing mode (in the History section - set Nightly to Never Remember History).

Steps to reproduce

1. Launch Firefox.
2. Go to about:preferences#privacy and Clear all data.
3. Browse various websites.
4. Click on the "End Private Session" button.
5. Confirm in about:preferences#privacy that all data, including cookies and cache, has been deleted.

Expected result

• All the data should be deleted.

Actual result

• Not all data is deleted - certain cache data remains even after session data deletion.

Regression range

• Not a regression.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

:sbadau, if you think that's a regression, could you try to find a regression range using for example mozregression?

Comment 2

[Emma Zühlcke [:emz]]

Worth looking into, but most likely not related to the "End Private Session" feature. about:preferences#privacy doesn't manage private browsing data, it only manages normal browsing data. It's possible that even if only private browsing windows are used we still make background requests for normal browsing (e.g. contacting mozilla services). These would show up in the site data tables. Worth looking into further.