Open Bug 1858131 Opened 2 years ago Updated 2 years ago

Intermittent data persistence in Private Session despite deleting session

Categories

(Firefox :: Private Browsing, defect, P3)

Desktop
All
defect

Tracking

()

Tracking Status
firefox-esr115 --- unaffected
firefox118 --- unaffected
firefox119 --- unaffected
firefox120 --- affected

People

(Reporter: sbadau, Unassigned)

Details

Found in

  • Nightly 120.0a1

Affected versions

  • Nightly 120.0a1

Tested platforms

  • Affected platforms: macOS 11.7, Ubuntu 22.04.

Steps to reproduce

  1. Open a new private window.
  2. Close the regular window.
  3. In the private window - navigate to about:preferences#privacy and "Clear Data"
  4. Navigate to multiple websites.
  5. Delete the private session data by clicking on the "End Private Session" button.
  6. Navigate to about:preferences#privacy and check the "Cookies and Site" section.

Expected result

  • There should be no data stored after the private session is deleted.

Actual result

  • Data is still stored after the private session data is deleted. Please see the screen recording for more details.

Regression range

  • Not a regression.

Additional notes

  • This issue is intermittent and is not consistently reproducible.
Summary: Intermittent data persistence in Private Session despite clearing → Intermittent data persistence in Private Session despite deleting session

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

Same as the other bug:
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.
If you see data from sites only visited in PBM show up in the about:preferences#privacy "manage data" table, that would be concerning, still unrelated to this feature though.

No longer blocks: 1846495, 1857239
Priority: -- → P3
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