Websites can detect private mode
Categories
(Firefox :: Private Browsing, defect)
Tracking
()
People
(Reporter: betam4x, Unassigned)
Details
Attachments
(1 file)
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1020.99 KB,
image/png
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Details |
private-window-detection.png
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0
Steps to reproduce:
Websites can detect when you are in private mode. An example of this is the Washington Post (see screenshot). This isn't done by IP address. I can open another browser, such as Chrome or Brave, and successfully navigate to the site.
This is a substantial privacy risk at minimum.
This has been reported to other browsers, and some of them have already fixed this issue. If this issue has been reported already for Firefox, I apologize. I searched, but found no results.
Actual results:
Website knew I was browsing in private browsing mode.
Expected results:
Website should not know I am browsing in private mode.
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Comment 1•4 years ago
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Bugbug thinks this bug should belong to this component, but please revert this change in case of error.
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Comment 2•4 years ago
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Resetting severity to default of --.
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Updated•4 years ago
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Description
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