The network channel is cancelled bv the URLClassifier with an anti-tracking specific error code: https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp#180 https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/netwerk/protocol/http/HttpBaseChannel.cpp#5466 Looks like this is passed on via `nsIRequest`, which we could check. As for hooking into the classifier externally and unblocking the request, you could maybe do it like here: https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/browser/extensions/webcompat/experiment-apis/trackingProtection.js#72 Passing the NI to Dimi who is more familiar with our tracker blocking integration.
Bug 1726362 Comment 20 Edit History
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The network channel is cancelled by the URLClassifier with an anti-tracking specific error code: https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp#180 https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/netwerk/protocol/http/HttpBaseChannel.cpp#5466 Looks like this is passed on via `nsIRequest`, which we could check. As for hooking into the classifier externally and unblocking the request, you could maybe do it like here: https://searchfox.org/mozilla-central/rev/5d2b9e940ca09bd1cbc15aa681f69424cde8904c/browser/extensions/webcompat/experiment-apis/trackingProtection.js#72 Passing the NI to Dimi who is more familiar with our tracker blocking integration.