Bug 1736867: Update tests within toolkit/components/antitracking/test/browser/ to work with https-first enabled r=timhuang

Differential Revision: https://phabricator.services.mozilla.com/D129051

toolkit/components/antitracking/test/browser/browser-blocking.ini

@@ -8,6 +8,8 @@ prefs =
   # Enable the window.open() heuristics globally in this directory
   privacy.restrict3rdpartystorage.heuristic.window_open=true
   privacy.restrict3rdpartystorage.heuristic.opened_window_after_interaction=true
+  # Disable https-first because of explicit http/https testing
+  dom.security.https_first=false
 
 support-files =
   head.js