** [https://searchfox.org/mozilla-central/rev/da499aac682d0bbda5829327b60a865cbc491611/dom/fetch/FetchDriver.h#164 Fetch uses it to set a flag] to honor [https://searchfox.org/mozilla-central/rev/da499aac682d0bbda5829327b60a865cbc491611/dom/fetch/FetchDriver.cpp#692-695 tailing] and [https://searchfox.org/mozilla-central/rev/da499aac682d0bbda5829327b60a865cbc491611/dom/fetch/FetchDriver.cpp#697-702 lowering networking priority] when [https://bugzilla.mozilla.org/show_bug.cgi?id=1312515 <tt>fetch()</tt> is called from a tracking script]
** XHR also [https://searchfox.org/mozilla-central/rev/da499aac682d0bbda5829327b60a865cbc491611/dom/xhr/XMLHttpRequestMainThread.cpp#2431-2449 uses it for the same tailing and lowering the priority] features when the [https://bugzilla.mozilla.org/show_bug.cgi?id=1312515 XHR comes from a tracking script]
=== Tests ===
In addition to the Safe Browsing tests, here are all of the tests which are relevant to tracking protection:
./mach test browser/base/content/test/trackingUI/
./mach test netwerk/test/unit/test_trackingProtection_annotateChannels.js
./mach test netwerk/test/unit_ipc/test_trackingProtection_annotateChannels_wrap1.js
./mach test netwerk/test/unit_ipc/test_trackingProtection_annotateChannels_wrap2.js
== Lists ==