Open Bug 1545048 Opened 1 year ago Updated 10 months ago

Ads may not appear when is blocked by fingerprinting blocking


(Core :: Privacy: Anti-Tracking, defect, P2)




Tracking Status
firefox-esr60 --- disabled
firefox66 --- disabled
firefox67 --- affected
firefox68 --- affected


(Reporter: ciprian_georgiu, Unassigned)


(Blocks 1 open bug)



(2 files)

Affected versions

  • latest Nightly 68.0a1
  • latest Beta 67.0b11

Affected platforms

  • Windows 10 x64
  • macOS 10.13
  • Ubuntu 18.04 x64


  • Go to about:config and change urlclassifier.features.fingerprinting.blacklistTables to base-fingerprinting-track-digest256,content-fingerprinting-track-digest256
  • Go to about:url-classifier and click “Trigger Update” in the mozilla row under the “Provider” heading.

Steps to reproduce

  1. Go to about:preferences#privacy and from Custom section un-check all items expect for "Fingerprinters".
  2. Access

Expected result

  • The top ad is NOT blocked on the webpage.

Actual result

  • The top ad is blocked on the webpage.

Regression range

  • Not a regression, I was able to reproduce this on older Nightly build 67.01 (20190211215545) as well, which is one of the first builds with this feature implemented.

Additional notes

  • please observe the attached screenshot.

Steven, do you have time to investigate this issue? This is similar to bug 1545044.

Flags: needinfo?(senglehardt)
Priority: -- → P2

It's difficult to determine exactly which blocklist rule caused ads not to appear in comment 0 since different ad placements load with each new page load. I tried reloading this page a bunch of times and the only time I saw ads fail to load was when was blocked. Let's use this bug to collect examples of breakage due to DoubleVerify blocking.

Flags: needinfo?(senglehardt)
Summary: Missing the top ad on if Fingerprinters are enabled → Ads may not appear when is blocked by fingerprinting blocking

If the issue is still reproducible, can you send us the log of firefox, generated by MOZ_LOG=AntiTracking:5,nsChannelClassifier:5 ?

Flags: needinfo?(ciprian.georgiu)
Attached file ad-fail.txt.moz_log

The issue is still preset, but in my case seem to be the domain that blocks the ad from being displayed. I've attached the logs.

Flags: needinfo?(ciprian.georgiu)
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