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diff --git a/netwerk/test/mochitests/test_1425031.html b/netwerk/test/mochitests/test_1425031.html
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+++ b/netwerk/test/mochitests/test_1425031.html
@@ -0,0 +1,73 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1425031
+-->
+<head>
+  <title>Cookies set in content processes update immediately.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1425031">Mozilla Bug 1425031</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<script type="application/javascript">
+
+// Verify that cookie operations initiated by content processes do not cause
+// asynchronous updates for those operations to be processed later.
+
+SimpleTest.waitForExplicitFinish();
+
+var gScript = SpecialPowers.loadChromeScript(SimpleTest.getTestFileURL('file_1331680.js'));
+var testsNum = 0;
+var cookieString = "cookie0=test";
+
+// Confirm the notify which represents the cookie is updating.
+function confirmCookieOperation(op) {
+  testsNum++;
+  switch(testsNum) {
+    case 1:
+      is(op, "added", "Confirm the cookie operation is added.");
+      is(document.cookie, cookieString, "Confirm the cookie string is unaffected by the addition");
+      break;
+    case 2:
+      is(op, "deleted", "Confirm the cookie operation is deleted.");
+      is(document.cookie, cookieString, "Confirm the cookie string is unaffected by the deletion");
+      break;
+    case 3:
+      is(op, "added", "Confirm the cookie operation is added.");
+      is(document.cookie, cookieString, "Confirm the cookie string is unaffected by the second addition.");
+      document.cookie = "cookie0=; expires=Thu, 01-Jan-1970 00:00:01 GMT;";
+      gScript.sendAsyncMessage('removeObserver');
+      SpecialPowers.clearUserPref("network.cookie.sameSite.laxByDefault");
+      SimpleTest.finish();
+      break;
+  }
+}
+
+function testSetCookie() {
+  document.cookie = cookieString;
+  is(document.cookie, cookieString, "Confirm cookie string.");
+  document.cookie = "cookie0=; expires=Thu, 01-Jan-1970 00:00:01 GMT;";
+  is(document.cookie, "", "Removed all cookies.");
+  document.cookie = cookieString;
+  is(document.cookie, cookieString, "Confirm cookie string.");
+}
+
+// Bug 1617611: Fix all the tests broken by "cookies SameSite=lax by default"
+SpecialPowers.pushPrefEnv({
+  set: [["network.cookie.sameSite.laxByDefault", false]],
+}, () => {
+  gScript.addMessageListener("cookieOperation", confirmCookieOperation);
+  gScript.addMessageListener("createObserver:return", testSetCookie);
+  gScript.sendAsyncMessage('createObserver');
+});
+
+</script>
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>