Bug 1722871: Do not explicitly call popPrefEnv after test finishes when annotated with https_first_disabled r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D121167

testing/mochitest/browser-test.js

@@ -798,13 +798,6 @@ Tester.prototype = {
       );
       let time = Date.now() - this.lastStartTime;
 
-      // HTTPS-First (Bug 1704453) TODO: in case a test is annoated
-      // with https_first_disabled then we explicitly flip the pref
-      // dom.security.https_first to false for the duration of the test.
-      if (this.currentTest.https_first_disabled) {
-        window.SpecialPowers.popPrefEnv();
-      }
-
       this.structuredLogger.testEnd(
         this.currentTest.path,
         "OK",