Adding upstream version 115.7.0esr.upstream/115.7.0esr upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 19:33:14 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 19:33:14 +0000
commit: 36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree: 105e8c98ddea1c1e4784a60a5a6410fa416be2de /netwerk/test/browser
parent: Initial commit. (diff)
download: firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
114 files changed, 5592 insertions, 0 deletions
diff --git a/netwerk/test/browser/103_preload.html b/netwerk/test/browser/103_preload.html
new file mode 100644
index 0000000000..9583815cfb
--- /dev/null
+++ b/netwerk/test/browser/103_preload.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+<body>
+<img src="https://example.com/browser/netwerk/test/browser/square.png" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/103_preload.html^headers^ b/netwerk/test/browser/103_preload.html^headers^
new file mode 100644
index 0000000000..9e23c73b7f
--- /dev/null
+++ b/netwerk/test/browser/103_preload.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache
diff --git a/netwerk/test/browser/103_preload.html^informationalResponse^ b/netwerk/test/browser/103_preload.html^informationalResponse^
new file mode 100644
index 0000000000..b95a96e74b
--- /dev/null
+++ b/netwerk/test/browser/103_preload.html^informationalResponse^
@@ -0,0 +1,2 @@
+HTTP 103 Too Early
+Link: <https://example.com/browser/netwerk/test/browser/square.png>; rel=preload; as=image
diff --git a/netwerk/test/browser/103_preload_anchor.html b/netwerk/test/browser/103_preload_anchor.html
new file mode 100644
index 0000000000..c12fe92072
--- /dev/null
+++ b/netwerk/test/browser/103_preload_anchor.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+<body>
+<img src="https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs?f5a05cb8-43e6-4868-bc0f-ca453ef87826" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/103_preload_anchor.html^headers^ b/netwerk/test/browser/103_preload_anchor.html^headers^
new file mode 100644
index 0000000000..9e23c73b7f
--- /dev/null
+++ b/netwerk/test/browser/103_preload_anchor.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache
diff --git a/netwerk/test/browser/103_preload_anchor.html^informationalResponse^ b/netwerk/test/browser/103_preload_anchor.html^informationalResponse^
new file mode 100644
index 0000000000..1099062e15
--- /dev/null
+++ b/netwerk/test/browser/103_preload_anchor.html^informationalResponse^
@@ -0,0 +1,2 @@
+HTTP 103 Early Hints
+Link: <netwerk/test/browser/early_hint_pixel.sjs?f5a05cb8-43e6-4868-bc0f-ca453ef87826>; rel=preload; as=image; anchor="/browser/"
diff --git a/netwerk/test/browser/103_preload_and_404.html b/netwerk/test/browser/103_preload_and_404.html
new file mode 100644
index 0000000000..f09f5cb085
--- /dev/null
+++ b/netwerk/test/browser/103_preload_and_404.html
@@ -0,0 +1,6 @@
+<html>
+  <head><title>404 Not Found</title></head>
+  <body>
+    <h1>404 Not Found</h1>
+  </body>
+</html>
diff --git a/netwerk/test/browser/103_preload_and_404.html^headers^ b/netwerk/test/browser/103_preload_and_404.html^headers^
new file mode 100644
index 0000000000..937e38c6c4
--- /dev/null
+++ b/netwerk/test/browser/103_preload_and_404.html^headers^
@@ -0,0 +1 @@
+HTTP 404 Not Found
diff --git a/netwerk/test/browser/103_preload_and_404.html^informationalResponse^ b/netwerk/test/browser/103_preload_and_404.html^informationalResponse^
new file mode 100644
index 0000000000..78cb7efea4
--- /dev/null
+++ b/netwerk/test/browser/103_preload_and_404.html^informationalResponse^
@@ -0,0 +1,2 @@
+HTTP 103 Early Hints
+Link: <https://example.com/browser/netwerk/test/browser/square.png>; rel=preload; as=image
diff --git a/netwerk/test/browser/103_preload_csp_imgsrc_none.html b/netwerk/test/browser/103_preload_csp_imgsrc_none.html
new file mode 100644
index 0000000000..367e80a6b3
--- /dev/null
+++ b/netwerk/test/browser/103_preload_csp_imgsrc_none.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+<body>
+<img src="https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs?1ac2a5e1-90c7-4171-b0f0-676f7d899af3" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/103_preload_csp_imgsrc_none.html^headers^ b/netwerk/test/browser/103_preload_csp_imgsrc_none.html^headers^
new file mode 100644
index 0000000000..b4dedd0812
--- /dev/null
+++ b/netwerk/test/browser/103_preload_csp_imgsrc_none.html^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-cache
+Content-Security-Policy: img-src 'none'
diff --git a/netwerk/test/browser/103_preload_csp_imgsrc_none.html^informationalResponse^ b/netwerk/test/browser/103_preload_csp_imgsrc_none.html^informationalResponse^
new file mode 100644
index 0000000000..d82224fd07
--- /dev/null
+++ b/netwerk/test/browser/103_preload_csp_imgsrc_none.html^informationalResponse^
@@ -0,0 +1,2 @@
+HTTP 103 Too Early
+Link: <https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs?1ac2a5e1-90c7-4171-b0f0-676f7d899af3>; rel=preload; as=image
diff --git a/netwerk/test/browser/103_preload_iframe.html b/netwerk/test/browser/103_preload_iframe.html
new file mode 100644
index 0000000000..815a14220f
--- /dev/null
+++ b/netwerk/test/browser/103_preload_iframe.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+<body>
+<iframe src="/browser/netwerk/test/browser/early_hint_main_html.sjs?early_hint_pixel.sjs=5ecccd01-dd3f-4bbd-bd3e-0491d7dd78a1" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/103_preload_iframe.html^headers^ b/netwerk/test/browser/103_preload_iframe.html^headers^
new file mode 100644
index 0000000000..9e23c73b7f
--- /dev/null
+++ b/netwerk/test/browser/103_preload_iframe.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache
diff --git a/netwerk/test/browser/auth_post.sjs b/netwerk/test/browser/auth_post.sjs
new file mode 100644
index 0000000000..8c3e723558
--- /dev/null
+++ b/netwerk/test/browser/auth_post.sjs
@@ -0,0 +1,37 @@
+const CC = Components.Constructor;
+const BinaryInputStream = CC(
+  "@mozilla.org/binaryinputstream;1",
+  "nsIBinaryInputStream",
+  "setInputStream"
+);
+
+function readStream(inputStream) {
+  let available = 0;
+  let result = [];
+  while ((available = inputStream.available()) > 0) {
+    result.push(inputStream.readBytes(available));
+  }
+
+  return result.join("");
+}
+
+function handleRequest(request, response) {
+  if (request.method != "POST") {
+    response.setStatusLine(request.httpVersion, 405, "Method Not Allowed");
+    return;
+  }
+
+  if (request.hasHeader("Authorization")) {
+    let data = "";
+    try {
+      data = readStream(new BinaryInputStream(request.bodyInputStream));
+    } catch (e) {
+      data = `${e}`;
+    }
+    response.bodyOutputStream.write(data, data.length);
+    return;
+  }
+
+  response.setStatusLine(request.httpVersion, 401, "Unauthorized");
+  response.setHeader("WWW-Authenticate", `basic realm="test"`, true);
+}
diff --git a/netwerk/test/browser/browser.ini b/netwerk/test/browser/browser.ini
new file mode 100644
index 0000000000..16e25fd245
--- /dev/null
+++ b/netwerk/test/browser/browser.ini
@@ -0,0 +1,146 @@
+[DEFAULT]
+support-files =
+  dummy.html
+  ioactivity.html
+  redirect.sjs
+  auth_post.sjs
+  early_hint_main_html.sjs
+  early_hint_pixel_count.sjs
+  early_hint_redirect.sjs
+  early_hint_redirect_html.sjs
+  early_hint_pixel.sjs
+  early_hint_error.sjs
+  early_hint_asset.sjs
+  early_hint_asset_html.sjs
+  early_hint_csp_options_html.sjs
+  early_hint_preconnect_html.sjs
+  post.html
+  res.css
+  res.css^headers^
+  res.csv
+  res.csv^headers^
+  res_206.html
+  res_206.html^headers^
+  res_nosniff.html
+  res_nosniff.html^headers^
+  res_img.png
+  res_nosniff2.html
+  res_nosniff2.html^headers^
+  res_not_ok.html
+  res_not_ok.html^headers^
+  res.unknown
+  res_img_unknown.png
+  res.mp3
+  res_invalid_partial.mp3
+  res_invalid_partial.mp3^headers^
+  res_206.mp3
+  res_206.mp3^headers^
+  res_not_200or206.mp3
+  res_not_200or206.mp3^headers^
+  res_img_for_unknown_decoder
+  res_img_for_unknown_decoder^headers^
+  res_object.html
+  res_sub_document.html
+  square.png
+  103_preload.html
+  103_preload.html^informationalResponse^
+  103_preload.html^headers^
+  no_103_preload.html
+  no_103_preload.html^headers^
+  103_preload_anchor.html^informationalResponse^
+  103_preload_anchor.html^headers^
+  103_preload_anchor.html
+  103_preload_and_404.html^informationalResponse^
+  103_preload_and_404.html^headers^
+  103_preload_and_404.html
+  103_preload_iframe.html
+  103_preload_iframe.html^headers^
+  103_preload_csp_imgsrc_none.html
+  103_preload_csp_imgsrc_none.html^headers^
+  103_preload_csp_imgsrc_none.html^informationalResponse^
+  cookie_filtering_resource.sjs
+  cookie_filtering_secure_resource_com.html
+  cookie_filtering_secure_resource_com.html^headers^
+  cookie_filtering_secure_resource_org.html
+  cookie_filtering_secure_resource_org.html^headers^
+  cookie_filtering_square.png
+  cookie_filtering_square.png^headers^
+  x_frame_options.html
+  x_frame_options.html^headers^
+  test_1629307.html
+  file_link_header.sjs
+
+[browser_about_cache.js]
+[browser_bug1535877.js]
+[browser_NetUtil.js]
+[browser_child_resource.js]
+skip-if = 
+  !crashreporter
+  os == "win" #Bug 1775761
+[browser_post_file.js]
+[browser_nsIFormPOSTActionChannel.js]
+skip-if = true # protocol handler and channel does not work in content process
+[browser_resource_navigation.js]
+[browser_test_io_activity.js]
+skip-if = socketprocess_networking
+[browser_cookie_sync_across_tabs.js]
+[browser_test_favicon.js]
+skip-if = (verify && (os == 'linux' || os == 'mac'))
+support-files =
+  damonbowling.jpg
+  damonbowling.jpg^headers^
+  file_favicon.html
+[browser_fetch_lnk.js]
+run-if = os == "win"
+support-files =
+  file_lnk.lnk
+[browser_post_auth.js]
+skip-if = socketprocess_networking # Bug 1772209
+[browser_backgroundtask_purgeHTTPCache.js]
+skip-if =
+  os == "android" # MultiInstanceLock doesn't work on Android
+  os == "mac" # intermittent TV timeouts on Mac
+[browser_103_telemetry.js]
+[browser_103_preload.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_preload_2.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_redirect.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_error.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_assets.js]
+[browser_103_no_cancel_on_error.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_redirect_from_server.js]
+[browser_cookie_filtering_basic.js]
+[browser_cookie_filtering_insecure.js]
+[browser_cookie_filtering_oa.js]
+[browser_cookie_filtering_cross_origin.js]
+[browser_cookie_filtering_subdomain.js]
+[browser_103_user_load.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_referrer_policy.js]
+support-files =
+  early_hint_referrer_policy_html.sjs
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_csp.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_csp_images.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_csp_styles.js]
+support-files =
+  early_hint_preload_test_helper.sys.mjs
+[browser_103_preconnect.js]
+[browser_103_cleanup.js]
+[browser_bug1629307.js]
+[browser_103_private_window.js]
+[browser_speculative_connection_link_header.js]
diff --git a/netwerk/test/browser/browser_103_assets.js b/netwerk/test/browser/browser_103_assets.js
new file mode 100644
index 0000000000..c8de25c2ca
--- /dev/null
+++ b/netwerk/test/browser/browser_103_assets.js
@@ -0,0 +1,171 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// On debug osx test machine, verify chaos mode takes slightly too long
+requestLongerTimeout(2);
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { request_count_checking } = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+// - testName is just there to be printed during Asserts when failing
+// - asset is the asset type, see early_hint_asset_html.sjs for possible values
+//   for the asset type fetch see test_hint_fetch due to timing issues
+// - variant:
+//   - "normal": no early hints, expects one normal request expected
+//   - "hinted": early hints sent, expects one hinted request
+//   - "reload": early hints sent, resources non-cacheable, two early-hint requests expected
+//   - "cached": same as reload, but resources are cacheable, so only one hinted network request expected
+async function test_hint_asset(testName, asset, variant) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "http://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=${asset}&hinted=${
+    variant !== "normal" ? "1" : "0"
+  }&cached=${variant === "cached" ? "1" : "0"}`;
+
+  let numConnectBackRemaining = 0;
+  if (variant === "hinted") {
+    numConnectBackRemaining = 1;
+  } else if (variant === "reload" || variant === "cached") {
+    numConnectBackRemaining = 2;
+  }
+
+  let observer = {
+    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+    observe(aSubject, aTopic, aData) {
+      if (aTopic == "earlyhints-connectback") {
+        numConnectBackRemaining -= 1;
+      }
+    },
+  };
+  Services.obs.addObserver(observer, "earlyhints-connectback");
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function (browser) {
+      if (asset === "fetch") {
+        // wait until the fetch is complete
+        await TestUtils.waitForCondition(_ => {
+          return SpecialPowers.spawn(browser, [], _ => {
+            return (
+              content.document.getElementsByTagName("h2")[0] != undefined &&
+              content.document.getElementsByTagName("h2")[0].textContent !==
+                "Fetching..." // default text set by early_hint_asset_html.sjs
+            );
+          });
+        });
+      }
+
+      // reload
+      if (variant === "reload" || variant === "cached") {
+        await BrowserTestUtils.reloadTab(gBrowser.selectedTab);
+      }
+
+      if (asset === "fetch") {
+        // wait until the fetch is complete
+        await TestUtils.waitForCondition(_ => {
+          return SpecialPowers.spawn(browser, [], _ => {
+            return (
+              content.document.getElementsByTagName("h2")[0] != undefined &&
+              content.document.getElementsByTagName("h2")[0].textContent !==
+                "Fetching..." // default text set by early_hint_asset_html.sjs
+            );
+          });
+        });
+      }
+    }
+  );
+  Services.obs.removeObserver(observer, "earlyhints-connectback");
+
+  let gotRequestCount = await fetch(
+    "http://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+  Assert.equal(
+    numConnectBackRemaining,
+    0,
+    `${testName} (${asset}) no remaining connect back expected`
+  );
+
+  let expectedRequestCount;
+  if (variant === "normal") {
+    expectedRequestCount = { hinted: 0, normal: 1 };
+  } else if (variant === "hinted") {
+    expectedRequestCount = { hinted: 1, normal: 0 };
+  } else if (variant === "reload") {
+    expectedRequestCount = { hinted: 2, normal: 0 };
+  } else if (variant === "cached") {
+    expectedRequestCount = { hinted: 1, normal: 0 };
+  }
+
+  await request_count_checking(
+    `${testName} (${asset})`,
+    gotRequestCount,
+    expectedRequestCount
+  );
+  if (variant === "cached") {
+    Services.cache2.clear();
+  }
+}
+
+// preload image
+add_task(async function test_103_asset_image() {
+  await test_hint_asset("test_103_asset_normal", "image", "normal");
+  await test_hint_asset("test_103_asset_hinted", "image", "hinted");
+  await test_hint_asset("test_103_asset_reload", "image", "reload");
+  // TODO(Bug 1815884): await test_hint_asset("test_103_asset_cached", "image", "cached");
+});
+
+// preload css
+add_task(async function test_103_asset_style() {
+  await test_hint_asset("test_103_asset_normal", "style", "normal");
+  await test_hint_asset("test_103_asset_hinted", "style", "hinted");
+  await test_hint_asset("test_103_asset_reload", "style", "reload");
+  // TODO(Bug 1815884): await test_hint_asset("test_103_asset_cached", "style", "cached");
+});
+
+// preload javascript
+add_task(async function test_103_asset_javascript() {
+  await test_hint_asset("test_103_asset_normal", "script", "normal");
+  await test_hint_asset("test_103_asset_hinted", "script", "hinted");
+  await test_hint_asset("test_103_asset_reload", "script", "reload");
+  await test_hint_asset("test_103_asset_cached", "script", "cached");
+});
+
+// preload javascript module
+/* TODO(Bug 1798319): enable this test case
+add_task(async function test_103_asset_module() {
+  await test_hint_asset("test_103_asset_normal", "module", "normal");
+  await test_hint_asset("test_103_asset_hinted", "module", "hinted");
+  await test_hint_asset("test_103_asset_reload", "module", "reload");
+  await test_hint_asset("test_103_asset_cached", "module", "cached");
+});
+*/
+
+// preload font
+add_task(async function test_103_asset_font() {
+  await test_hint_asset("test_103_asset_normal", "font", "normal");
+  await test_hint_asset("test_103_asset_hinted", "font", "hinted");
+  await test_hint_asset("test_103_asset_reload", "font", "reload");
+  await test_hint_asset("test_103_asset_cached", "font", "cached");
+});
+
+// preload fetch
+add_task(async function test_103_asset_fetch() {
+  await test_hint_asset("test_103_asset_normal", "fetch", "normal");
+  await test_hint_asset("test_103_asset_hinted", "fetch", "hinted");
+  await test_hint_asset("test_103_asset_reload", "fetch", "reload");
+  await test_hint_asset("test_103_asset_cached", "fetch", "cached");
+});
diff --git a/netwerk/test/browser/browser_103_cleanup.js b/netwerk/test/browser/browser_103_cleanup.js
new file mode 100644
index 0000000000..c823f5f01a
--- /dev/null
+++ b/netwerk/test/browser/browser_103_cleanup.js
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+add_task(async function test_103_cancel_parent_connect() {
+  Services.prefs.setIntPref("network.early-hints.parent-connect-timeout", 1);
+
+  let callback;
+  let promise = new Promise(resolve => {
+    callback = resolve;
+  });
+  let observed_cancel_reason = "";
+  let observer = {
+    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+    observe(aSubject, aTopic, aData) {
+      aSubject = aSubject.QueryInterface(Ci.nsIRequest);
+      if (
+        aTopic == "http-on-stop-request" &&
+        aSubject.name ==
+          "https://example.com/browser/netwerk/test/browser/square.png"
+      ) {
+        observed_cancel_reason = aSubject.canceledReason;
+        Services.obs.removeObserver(observer, "http-on-stop-request");
+        callback();
+      }
+    },
+  };
+  Services.obs.addObserver(observer, "http-on-stop-request");
+
+  // test that no crash or memory leak happens when cancelling before
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "https://example.com/browser/netwerk/test/browser/103_preload.html",
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+  await promise;
+  Assert.equal(observed_cancel_reason, "parent-connect-timeout");
+
+  Services.prefs.clearUserPref("network.early-hints.parent-connect-timeout");
+});
diff --git a/netwerk/test/browser/browser_103_csp.js b/netwerk/test/browser/browser_103_csp.js
new file mode 100644
index 0000000000..1786bac454
--- /dev/null
+++ b/netwerk/test/browser/browser_103_csp.js
@@ -0,0 +1,86 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { test_preload_hint_and_request } = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+add_task(async function test_preload_images_csp_in_early_hints_response() {
+  let tests = [
+    {
+      input: {
+        test_name: "image - no csp",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "image img-src 'self';",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'self';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "image img-src 'self'; same host provided",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'self';",
+        host: "https://example.com/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "image img-src 'self'; other host provided",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'self';",
+        host: "https://example.org/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+    {
+      input: {
+        test_name: "image img-src 'none';",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'none';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+    {
+      input: {
+        test_name: "image img-src 'none'; same host provided",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'none';",
+        host: "https://example.com/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+  ];
+
+  for (let test of tests) {
+    await test_preload_hint_and_request(test.input, test.expected);
+  }
+});
diff --git a/netwerk/test/browser/browser_103_csp_images.js b/netwerk/test/browser/browser_103_csp_images.js
new file mode 100644
index 0000000000..c089f29898
--- /dev/null
+++ b/netwerk/test/browser/browser_103_csp_images.js
@@ -0,0 +1,170 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+// This verifies hints, requests server-side and client-side that the image actually loaded
+async function test_image_preload_hint_request_loaded(
+  input,
+  expected_results,
+  image_should_load
+) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_csp_options_html.sjs?as=${
+    input.resource_type
+  }&hinted=${input.hinted ? "1" : "0"}${input.csp ? "&csp=" + input.csp : ""}${
+    input.csp_in_early_hint
+      ? "&csp_in_early_hint=" + input.csp_in_early_hint
+      : ""
+  }${input.host ? "&host=" + input.host : ""}`;
+
+  console.log("requestUrl: " + requestUrl);
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function (browser) {
+      let imageLoaded = await ContentTask.spawn(browser, [], function () {
+        let image = content.document.getElementById("test_image");
+        return image && image.complete && image.naturalHeight !== 0;
+      });
+      await Assert.ok(
+        image_should_load == imageLoaded,
+        "test_image_preload_hint_request_loaded: the image can be loaded as expected " +
+          requestUrl
+      );
+    }
+  );
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  await Assert.deepEqual(gotRequestCount, expected_results, input.test_name);
+
+  Services.cache2.clear();
+}
+
+// These tests verify whether or not the image actually loaded in the document
+add_task(async function test_images_loaded_with_csp() {
+  let tests = [
+    {
+      input: {
+        test_name: "image loaded - no csp",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+      image_should_load: true,
+    },
+    {
+      input: {
+        test_name: "image loaded - img-src none",
+        resource_type: "image",
+        csp: "img-src 'none';",
+        csp_in_early_hint: "",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+      image_should_load: false,
+    },
+    {
+      input: {
+        test_name: "image loaded - img-src none in EH response",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'none';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+      image_should_load: true,
+    },
+    {
+      input: {
+        test_name: "image loaded - img-src none in both headers",
+        resource_type: "image",
+        csp: "img-src 'none';",
+        csp_in_early_hint: "img-src 'none';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 0 },
+      image_should_load: false,
+    },
+    {
+      input: {
+        test_name: "image loaded - img-src self",
+        resource_type: "image",
+        csp: "img-src 'self';",
+        csp_in_early_hint: "",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+      image_should_load: true,
+    },
+    {
+      input: {
+        test_name: "image loaded - img-src self in EH response",
+        resource_type: "image",
+        csp: "",
+        csp_in_early_hint: "img-src 'self';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+      image_should_load: true,
+    },
+    {
+      input: {
+        test_name: "image loaded - conflicting csp, early hint skipped",
+        resource_type: "image",
+        csp: "img-src 'self';",
+        csp_in_early_hint: "img-src 'none';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+      image_should_load: true,
+    },
+    {
+      input: {
+        test_name:
+          "image loaded - conflicting csp, resource not loaded in document",
+        resource_type: "image",
+        csp: "img-src 'none';",
+        csp_in_early_hint: "img-src 'self';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+      image_should_load: false,
+    },
+  ];
+
+  for (let test of tests) {
+    await test_image_preload_hint_request_loaded(
+      test.input,
+      test.expected,
+      test.image_should_load
+    );
+  }
+});
diff --git a/netwerk/test/browser/browser_103_csp_styles.js b/netwerk/test/browser/browser_103_csp_styles.js
new file mode 100644
index 0000000000..59c2fc14be
--- /dev/null
+++ b/netwerk/test/browser/browser_103_csp_styles.js
@@ -0,0 +1,86 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { test_preload_hint_and_request } = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+add_task(async function test_preload_styles_csp_in_response() {
+  let tests = [
+    {
+      input: {
+        test_name: "style - no csp",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "style style-src 'self';",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "style-src 'self';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "style style-src self; same host provided",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "style-src 'self';",
+        host: "https://example.com/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0 },
+    },
+    {
+      input: {
+        test_name: "style style-src 'self'; other host provided",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "style-src 'self';",
+        host: "https://example.org/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+    {
+      input: {
+        test_name: "style style-src 'none';",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "style-src 'none';",
+        host: "",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+    {
+      input: {
+        test_name: "style style-src 'none'; other host provided",
+        resource_type: "style",
+        csp: "",
+        csp_in_early_hint: "style-src 'none';",
+        host: "https://example.org/browser/netwerk/test/browser/",
+        hinted: true,
+      },
+      expected: { hinted: 0, normal: 1 },
+    },
+  ];
+
+  for (let test of tests) {
+    await test_preload_hint_and_request(test.input, test.expected);
+  }
+});
diff --git a/netwerk/test/browser/browser_103_error.js b/netwerk/test/browser/browser_103_error.js
new file mode 100644
index 0000000000..a7a447aa7e
--- /dev/null
+++ b/netwerk/test/browser/browser_103_error.js
@@ -0,0 +1,121 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { test_hint_preload } = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+// 400 Bad Request
+add_task(async function test_103_error_400() {
+  await test_hint_preload(
+    "test_103_error_400",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?400",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 401 Unauthorized
+add_task(async function test_103_error_401() {
+  await test_hint_preload(
+    "test_103_error_401",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?401",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 403 Forbidden
+add_task(async function test_103_error_403() {
+  await test_hint_preload(
+    "test_103_error_403",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?403",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 404 Not Found
+add_task(async function test_103_error_404() {
+  await test_hint_preload(
+    "test_103_error_404",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?404",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 408 Request Timeout
+add_task(async function test_103_error_408() {
+  await test_hint_preload(
+    "test_103_error_408",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?408",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 410 Gone
+add_task(async function test_103_error_410() {
+  await test_hint_preload(
+    "test_103_error_410",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?410",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 429 Too Many Requests
+add_task(async function test_103_error_429() {
+  await test_hint_preload(
+    "test_103_error_429",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?429",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 500 Internal Server Error
+add_task(async function test_103_error_500() {
+  await test_hint_preload(
+    "test_103_error_500",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?500",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 502 Bad Gateway
+add_task(async function test_103_error_502() {
+  await test_hint_preload(
+    "test_103_error_502",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?502",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 503 Service Unavailable
+add_task(async function test_103_error_503() {
+  await test_hint_preload(
+    "test_103_error_503",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?503",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// 504 Gateway Timeout
+add_task(async function test_103_error_504() {
+  await test_hint_preload(
+    "test_103_error_504",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_error.sjs?504",
+    { hinted: 1, normal: 0 }
+  );
+});
diff --git a/netwerk/test/browser/browser_103_no_cancel_on_error.js b/netwerk/test/browser/browser_103_no_cancel_on_error.js
new file mode 100644
index 0000000000..2420441585
--- /dev/null
+++ b/netwerk/test/browser/browser_103_no_cancel_on_error.js
@@ -0,0 +1,67 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { request_count_checking } = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+// - httpCode is the response code we're testing for. This file mostly covers 400 and 500 responses
+async function test_hint_completion_on_error(httpCode) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_asset_html.sjs?hinted=1&as=image&code=${httpCode}`;
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  await request_count_checking(`test_103_error_${httpCode}`, gotRequestCount, {
+    hinted: 1,
+    normal: 0,
+  });
+}
+
+// 400 Bad Request
+add_task(async function test_complete_103_on_400() {
+  await test_hint_completion_on_error(400);
+});
+add_task(async function test_complete_103_on_401() {
+  await test_hint_completion_on_error(401);
+});
+add_task(async function test_complete_103_on_402() {
+  await test_hint_completion_on_error(402);
+});
+add_task(async function test_complete_103_on_403() {
+  await test_hint_completion_on_error(403);
+});
+add_task(async function test_complete_103_on_500() {
+  await test_hint_completion_on_error(500);
+});
+add_task(async function test_complete_103_on_501() {
+  await test_hint_completion_on_error(501);
+});
+add_task(async function test_complete_103_on_502() {
+  await test_hint_completion_on_error(502);
+});
diff --git a/netwerk/test/browser/browser_103_preconnect.js b/netwerk/test/browser/browser_103_preconnect.js
new file mode 100644
index 0000000000..dcdcc1b138
--- /dev/null
+++ b/netwerk/test/browser/browser_103_preconnect.js
@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+Services.prefs.setBoolPref("network.early-hints.preconnect.enabled", true);
+Services.prefs.setBoolPref("network.http.debug-observations", true);
+Services.prefs.setIntPref("network.early-hints.preconnect.max_connections", 10);
+
+registerCleanupFunction(function () {
+  Services.prefs.clearUserPref("network.early-hints.enabled");
+  Services.prefs.clearUserPref("network.early-hints.preconnect.enabled");
+  Services.prefs.clearUserPref("network.http.debug-observations");
+  Services.prefs.clearUserPref(
+    "network.early-hints.preconnect.max_connections"
+  );
+});
+
+// Test steps:
+// 1. Load early_hint_preconnect_html.sjs
+// 2. In early_hint_preconnect_html.sjs, a 103 response with
+//    "rel=preconnect" is returned.
+// 3. We use "speculative-connect-request" topic to observe whether the
+//    speculative connection is attempted.
+// 4. Finally, we check if the observed URL is the same as the expected.
+async function test_hint_preconnect(href, crossOrigin) {
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_preconnect_html.sjs?href=${href}&crossOrigin=${crossOrigin}`;
+
+  let observed = "";
+  let observer = {
+    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+    observe(aSubject, aTopic, aData) {
+      if (aTopic == "speculative-connect-request") {
+        Services.obs.removeObserver(observer, "speculative-connect-request");
+        observed = aData;
+      }
+    },
+  };
+  Services.obs.addObserver(observer, "speculative-connect-request");
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  // Extracting "localhost:443"
+  let hostPortRegex = /\[.*\](.*?)\^/;
+  let hostPortMatch = hostPortRegex.exec(observed);
+  let hostPort = hostPortMatch ? hostPortMatch[1] : "";
+  // Extracting "%28https%2Cexample.com%29"
+  let partitionKeyRegex = /\^partitionKey=(.*)$/;
+  let partitionKeyMatch = partitionKeyRegex.exec(observed);
+  let partitionKey = partitionKeyMatch ? partitionKeyMatch[1] : "";
+  // See nsHttpConnectionInfo::BuildHashKey, the second character is A if this
+  // is an anonymous connection.
+  let anonymousFlag = observed[2];
+
+  Assert.equal(anonymousFlag, crossOrigin === "use-credentials" ? "." : "A");
+  Assert.equal(hostPort, "localhost:443");
+  Assert.equal(partitionKey, "%28https%2Cexample.com%29");
+}
+
+add_task(async function test_103_preconnect() {
+  await test_hint_preconnect("https://localhost", "use-credentials");
+  await test_hint_preconnect("https://localhost", "");
+  await test_hint_preconnect("https://localhost", "anonymous");
+});
diff --git a/netwerk/test/browser/browser_103_preload.js b/netwerk/test/browser/browser_103_preload.js
new file mode 100644
index 0000000000..38bf7bffbe
--- /dev/null
+++ b/netwerk/test/browser/browser_103_preload.js
@@ -0,0 +1,137 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+// Disable mixed-content upgrading as this test is expecting HTTP image loads
+Services.prefs.setBoolPref(
+  "security.mixed_content.upgrade_display_content",
+  false
+);
+
+const {
+  request_count_checking,
+  test_hint_preload_internal,
+  test_hint_preload,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+// TODO testing:
+//  * Abort main document load while early hint is still loading -> early hint should be aborted
+
+// Test that with early hint config option disabled, no early hint requests are made
+add_task(async function test_103_preload_disabled() {
+  Services.prefs.setBoolPref("network.early-hints.enabled", false);
+  await test_hint_preload(
+    "test_103_preload_disabled",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 1 }
+  );
+  Services.prefs.setBoolPref("network.early-hints.enabled", true);
+});
+
+// Test that with preload config option disabled, no early hint requests are made
+add_task(async function test_103_preload_disabled() {
+  Services.prefs.setBoolPref("network.preload", false);
+  await test_hint_preload(
+    "test_103_preload_disabled",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 1 }
+  );
+  Services.prefs.clearUserPref("network.preload");
+});
+
+// Preload with same origin in secure context with mochitest http proxy
+add_task(async function test_103_preload_https() {
+  await test_hint_preload(
+    "test_103_preload_https",
+    "https://example.org",
+    "/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Preload with same origin in secure context
+add_task(async function test_103_preload() {
+  await test_hint_preload(
+    "test_103_preload",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Cross origin preload in secure context
+add_task(async function test_103_preload_cor() {
+  await test_hint_preload(
+    "test_103_preload_cor",
+    "https://example.com",
+    "https://example.net/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Cross origin preload in insecure context
+add_task(async function test_103_preload_insecure_cor() {
+  await test_hint_preload(
+    "test_103_preload_insecure_cor",
+    "https://example.com",
+    "http://mochi.test:8888/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 1 }
+  );
+});
+
+// Same origin request with relative url
+add_task(async function test_103_relative_preload() {
+  await test_hint_preload(
+    "test_103_relative_preload",
+    "https://example.com",
+    "/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Early hint from insecure context
+add_task(async function test_103_insecure_preload() {
+  await test_hint_preload(
+    "test_103_insecure_preload",
+    "http://mochi.test:8888",
+    "/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 1 }
+  );
+});
+
+// Cross origin preload from secure context to insecure context on same domain
+add_task(async function test_103_preload_mixed_content() {
+  await test_hint_preload(
+    "test_103_preload_mixed_content",
+    "https://example.org",
+    "http://example.org/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 1 }
+  );
+});
+
+// Same preload from localhost to localhost should preload
+add_task(async function test_103_preload_localhost_to_localhost() {
+  await test_hint_preload(
+    "test_103_preload_localhost_to_localhost",
+    "http://127.0.0.1:8888",
+    "http://127.0.0.1:8888/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Relative url, correct file for requested uri
+add_task(async function test_103_preload_only_file() {
+  await test_hint_preload(
+    "test_103_preload_only_file",
+    "https://example.com",
+    "early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 }
+  );
+});
diff --git a/netwerk/test/browser/browser_103_preload_2.js b/netwerk/test/browser/browser_103_preload_2.js
new file mode 100644
index 0000000000..c9f92fdef5
--- /dev/null
+++ b/netwerk/test/browser/browser_103_preload_2.js
@@ -0,0 +1,180 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const {
+  test_hint_preload,
+  test_hint_preload_internal,
+  request_count_checking,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+// two early hint responses
+add_task(async function test_103_two_preload_responses() {
+  await test_hint_preload_internal(
+    "103_two_preload_responses",
+    "https://example.com",
+    [
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+      ["", "new_response"], // indicate new early hint response
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+    ],
+    { hinted: 1, normal: 1 }
+  );
+});
+
+// two link header in one early hint response
+add_task(async function test_103_two_link_header() {
+  await test_hint_preload_internal(
+    "103_two_link_header",
+    "https://example.com",
+    [
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+      ["", ""], // indicate new link header in same reponse
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+    ],
+    { hinted: 2, normal: 0 }
+  );
+});
+
+// two links in one early hint link header
+add_task(async function test_103_two_links() {
+  await test_hint_preload_internal(
+    "103_two_links",
+    "https://example.com",
+    [
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+    ],
+    { hinted: 2, normal: 0 }
+  );
+});
+
+// two early hint responses, only second one has a link header
+add_task(async function test_103_two_links() {
+  await test_hint_preload_internal(
+    "103_two_links",
+    "https://example.com",
+    [
+      ["", "non_link_header"], // indicate non-link related header
+      ["", "new_response"], // indicate new early hint response
+      [
+        "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+        Services.uuid.generateUUID().toString(),
+      ],
+    ],
+    { hinted: 1, normal: 0 }
+  );
+});
+
+// Preload twice same origin in secure context
+add_task(async function test_103_preload_twice() {
+  // pass two times the same uuid so that on the second request, the response is
+  // already in the cache
+  let uuid = Services.uuid.generateUUID();
+  await test_hint_preload(
+    "test_103_preload_twice_1",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 1, normal: 0 },
+    uuid
+  );
+  await test_hint_preload(
+    "test_103_preload_twice_2",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 0, normal: 0 },
+    uuid
+  );
+});
+
+// Test that preloads in iframes don't get triggered
+add_task(async function test_103_iframe() {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let iframeUri =
+    "https://example.com/browser/netwerk/test/browser/103_preload_iframe.html";
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: iframeUri,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+  let expectedRequestCount = { hinted: 0, normal: 1 };
+
+  await request_count_checking(
+    "test_103_iframe",
+    gotRequestCount,
+    expectedRequestCount
+  );
+
+  Services.cache2.clear();
+});
+
+// Test that anchors are parsed
+add_task(async function test_103_anchor() {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let anchorUri =
+    "https://example.com/browser/netwerk/test/browser/103_preload_anchor.html";
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: anchorUri,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  await request_count_checking("test_103_anchor", gotRequestCount, {
+    hinted: 0,
+    normal: 1,
+  });
+});
diff --git a/netwerk/test/browser/browser_103_private_window.js b/netwerk/test/browser/browser_103_private_window.js
new file mode 100644
index 0000000000..2d6daf9501
--- /dev/null
+++ b/netwerk/test/browser/browser_103_private_window.js
@@ -0,0 +1,70 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+registerCleanupFunction(function () {
+  Services.prefs.clearUserPref("network.early-hints.enabled");
+});
+
+// Test steps:
+// 1. Load early_hint_asset_html.sjs with a provided uuid.
+// 2. In early_hint_asset_html.sjs, a 103 response with
+//    a Link header<early_hint_asset.sjs> and the provided uuid is returned.
+// 3. We use "http-on-opening-request" topic to observe whether the
+//    early hinted request is created.
+// 4. Finally, we check if the request has the correct `isPrivate` value.
+async function test_early_hints_load_url(usePrivateWin) {
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  // Open a browsing window.
+  const win = await BrowserTestUtils.openNewBrowserWindow({
+    private: usePrivateWin,
+  });
+
+  let id = Services.uuid.generateUUID().toString();
+  let expectedUrl = `https://example.com/browser/netwerk/test/browser/early_hint_asset.sjs?as=fetch&uuid=${id}`;
+  let observed = {};
+  let observer = {
+    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+    observe(aSubject, aTopic, aData) {
+      if (aTopic == "http-on-opening-request") {
+        let channel = aSubject.QueryInterface(Ci.nsIHttpChannel);
+        if (channel.URI.spec === expectedUrl) {
+          observed.actrualUrl = channel.URI.spec;
+          let isPrivate = channel.QueryInterface(
+            Ci.nsIPrivateBrowsingChannel
+          ).isChannelPrivate;
+          observed.isPrivate = isPrivate;
+          Services.obs.removeObserver(observer, "http-on-opening-request");
+        }
+      }
+    },
+  };
+  Services.obs.addObserver(observer, "http-on-opening-request");
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=fetch&hinted=1&uuid=${id}`;
+
+  const browser = win.gBrowser.selectedTab.linkedBrowser;
+  let loaded = BrowserTestUtils.browserLoaded(browser, false, requestUrl);
+  BrowserTestUtils.loadURIString(browser, requestUrl);
+  await loaded;
+
+  Assert.equal(observed.actrualUrl, expectedUrl);
+  Assert.equal(observed.isPrivate, usePrivateWin);
+
+  await BrowserTestUtils.closeWindow(win);
+}
+
+add_task(async function test_103_private_window() {
+  await test_early_hints_load_url(true);
+  await test_early_hints_load_url(false);
+});
diff --git a/netwerk/test/browser/browser_103_redirect.js b/netwerk/test/browser/browser_103_redirect.js
new file mode 100644
index 0000000000..d396813d50
--- /dev/null
+++ b/netwerk/test/browser/browser_103_redirect.js
@@ -0,0 +1,52 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+const { test_hint_preload, request_count_checking } =
+  ChromeUtils.importESModule(
+    "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+  );
+
+// Early hint to redirect to same origin in secure context
+add_task(async function test_103_redirect_same_origin() {
+  await test_hint_preload(
+    "test_103_redirect_same_origin",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_redirect.sjs?https://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 2, normal: 0 } // successful preload of redirect and resulting image
+  );
+});
+
+// Early hint to redirect to cross origin in secure context
+add_task(async function test_103_redirect_cross_origin() {
+  await test_hint_preload(
+    "test_103_redirect_cross_origin",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_redirect.sjs?https://example.net/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 2, normal: 0 }
+  );
+});
+
+// Early hint to redirect to cross origin in insecure context
+add_task(async function test_103_redirect_insecure_cross_origin() {
+  await test_hint_preload(
+    "test_103_redirect_insecure_cross_origin",
+    "https://example.com",
+    "https://example.com/browser/netwerk/test/browser/early_hint_redirect.sjs?http://mochi.test:8888/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 2, normal: 0 }
+  );
+});
+
+// Cross origin preload from secure context to redirected insecure context on same domain
+add_task(async function test_103_preload_redirect_mixed_content() {
+  await test_hint_preload(
+    "test_103_preload_redirect_mixed_content",
+    "https://example.org",
+    "https://example.org/browser/netwerk/test/browser/early_hint_redirect.sjs?http://example.org/browser/netwerk/test/browser/early_hint_pixel.sjs",
+    { hinted: 2, normal: 0 }
+  );
+});
diff --git a/netwerk/test/browser/browser_103_redirect_from_server.js b/netwerk/test/browser/browser_103_redirect_from_server.js
new file mode 100644
index 0000000000..0357d11516
--- /dev/null
+++ b/netwerk/test/browser/browser_103_redirect_from_server.js
@@ -0,0 +1,321 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+registerCleanupFunction(function () {
+  Services.prefs.clearUserPref("network.early-hints.enabled");
+});
+
+// This function tests Early Hint responses before and in between HTTP redirects.
+//
+// Arguments:
+// - name: String identifying the test case for easier parsing in the log
+// - chain and destination: defines the redirect chain, see example below
+//                          note: ALL preloaded urls must be image urls
+// - expected: number of normal, cancelled and completed hinted responses.
+//
+// # Example
+// The parameter values of
+// ```
+// chain = [
+//  {link:"https://link1", host:"https://host1.com"},
+//  {link:"https://link2", host:"https://host2.com"},
+// ]
+// ```
+// and `destination = "https://host3.com/page.html" would result in the
+// following HTTP exchange (simplified):
+//
+// ```
+// > GET https://host1.com/redirect?something1
+//
+// < 103 Early Hints
+// < Link: <https://link1>;rel=preload;as=image
+// <
+// < 307 Temporary Redirect
+// < Location: https://host2.com/redirect?something2
+// <
+//
+// > GET https://host2.com/redirect?something2
+//
+// < 103 Early Hints
+// < Link: <https://link2>;rel=preload;as=image
+// <
+// < 307 Temporary Redirect
+// < Location: https://host3.com/page.html
+// <
+//
+// > GET https://host3.com/page.html
+//
+// < [...] Result depends on the final page
+// ```
+//
+// Legend:
+// * `>` indicates a request going from client to server
+// * `<` indicates a response going from server to client
+// * all lines are terminated with a `\r\n`
+//
+async function test_hint_redirect(
+  name,
+  chain,
+  destination,
+  hint_destination,
+  expected
+) {
+  // pass the full redirect chain as a url parameter. Each redirect is handled
+  // by `early_hint_redirect_html.sjs` which url-decodes the query string and
+  // redirects to the result
+  let links = [];
+  let url = destination;
+  for (let i = chain.length - 1; i >= 0; i--) {
+    let qp = new URLSearchParams();
+    if (chain[i].link != "") {
+      qp.append("link", "<" + chain[i].link + ">;rel=preload;as=image");
+      links.push(chain[i].link);
+    }
+    qp.append("location", url);
+
+    url = `${
+      chain[i].host
+    }/browser/netwerk/test/browser/early_hint_redirect_html.sjs?${qp.toString()}`;
+  }
+  if (hint_destination != "") {
+    links.push(hint_destination);
+  }
+
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  // main request and all other must get their respective OnStopRequest
+  let numRequestRemaining =
+    expected.normal + expected.hinted + expected.cancelled;
+  let observed = {
+    hinted: 0,
+    normal: 0,
+    cancelled: 0,
+  };
+  // store channelIds
+  let observedChannelIds = [];
+  let callback;
+  let promise = new Promise(resolve => {
+    callback = resolve;
+  });
+  if (numRequestRemaining > 0) {
+    let observer = {
+      QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+      observe(aSubject, aTopic, aData) {
+        aSubject.QueryInterface(Ci.nsIIdentChannel);
+        let id = aSubject.channelId;
+        if (observedChannelIds.includes(id)) {
+          return;
+        }
+        aSubject.QueryInterface(Ci.nsIRequest);
+        dump("Observer aSubject.name " + aSubject.name + "\n");
+        if (aTopic == "http-on-stop-request" && links.includes(aSubject.name)) {
+          if (aSubject.status == Cr.NS_ERROR_ABORT) {
+            observed.cancelled += 1;
+          } else {
+            aSubject.QueryInterface(Ci.nsIHttpChannel);
+            let initiator = "";
+            try {
+              initiator = aSubject.getRequestHeader("X-Moz");
+            } catch {}
+            if (initiator == "early hint") {
+              observed.hinted += 1;
+            } else {
+              observed.normal += 1;
+            }
+          }
+          observedChannelIds.push(id);
+          numRequestRemaining -= 1;
+          dump("Observer numRequestRemaining " + numRequestRemaining + "\n");
+        }
+        if (numRequestRemaining == 0) {
+          Services.obs.removeObserver(observer, "http-on-stop-request");
+          callback();
+        }
+      },
+    };
+    Services.obs.addObserver(observer, "http-on-stop-request");
+  } else {
+    callback();
+  }
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  // wait until all requests are stopped, especially the cancelled ones
+  await promise;
+
+  let got = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  // stringify to pretty print assert output
+  let g = JSON.stringify(observed);
+  let e = JSON.stringify(expected);
+  Assert.equal(
+    expected.normal,
+    observed.normal,
+    `${name} normal observed from client expected ${expected.normal} (${e}) got ${observed.normal} (${g})`
+  );
+  Assert.equal(
+    expected.hinted,
+    observed.hinted,
+    `${name} hinted observed from client expected ${expected.hinted} (${e})  got ${observed.hinted} (${g})`
+  );
+  Assert.equal(
+    expected.cancelled,
+    observed.cancelled,
+    `${name} cancelled observed from client expected ${expected.cancelled} (${e})  got ${observed.cancelled} (${g})`
+  );
+
+  // each cancelled request might be cancelled after the request was already
+  // made. Allow cancelled responses to count towards the hinted to avoid
+  // intermittent test failures.
+  Assert.ok(
+    expected.hinted <= got.hinted &&
+      got.hinted <= expected.hinted + expected.cancelled,
+    `${name}: unexpected amount of hinted request made got ${
+      got.hinted
+    }, expected between ${expected.hinted} and ${
+      expected.hinted + expected.cancelled
+    }`
+  );
+  Assert.ok(
+    got.normal == expected.normal,
+    `${name}: unexpected amount of normal request made expected ${expected.normal}, got ${got.normal}`
+  );
+  Assert.equal(numRequestRemaining, 0, "Requests remaining");
+}
+
+add_task(async function double_redirect_cross_origin() {
+  await test_hint_redirect(
+    "double_redirect_cross_origin_both_hints",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.com/",
+      },
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.net",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=1",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 2 }
+  );
+  await test_hint_redirect(
+    "double_redirect_second_hint",
+    [
+      {
+        link: "",
+        host: "https://example.com/",
+      },
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.net",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=1",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 1 }
+  );
+  await test_hint_redirect(
+    "double_redirect_first_hint",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.com/",
+      },
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.net",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=0",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 0, normal: 1, cancelled: 2 }
+  );
+});
+
+add_task(async function redirect_cross_origin() {
+  await test_hint_redirect(
+    "redirect_cross_origin_start_second_preload",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.net",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=1",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 1 }
+  );
+  await test_hint_redirect(
+    "redirect_cross_origin_dont_use_first_preload",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image&a",
+        host: "https://example.net",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=0",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 0, normal: 1, cancelled: 1 }
+  );
+});
+
+add_task(async function redirect_same_origin() {
+  await test_hint_redirect(
+    "hint_before_redirect_same_origin",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.org",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=1",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 0 }
+  );
+  await test_hint_redirect(
+    "hint_after_redirect_same_origin",
+    [
+      {
+        link: "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+        host: "https://example.org",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=0",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 0 }
+  );
+  await test_hint_redirect(
+    "hint_after_redirect_same_origin",
+    [
+      {
+        link: "",
+        host: "https://example.org",
+      },
+    ],
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=image&hinted=1",
+    "https://example.org/browser/netwerk/test/browser/early_hint_asset.sjs?as=image",
+    { hinted: 1, normal: 0, cancelled: 0 }
+  );
+});
diff --git a/netwerk/test/browser/browser_103_referrer_policy.js b/netwerk/test/browser/browser_103_referrer_policy.js
new file mode 100644
index 0000000000..646b7255fd
--- /dev/null
+++ b/netwerk/test/browser/browser_103_referrer_policy.js
@@ -0,0 +1,167 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+async function test_referrer_policy(input, expected_results) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_referrer_policy_html.sjs?action=reset_referrer_results"
+  );
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_referrer_policy_html.sjs?as=${
+    input.resource_type
+  }&hinted=${input.hinted ? "1" : "0"}${
+    input.header_referrer_policy
+      ? "&header_referrer_policy=" + input.header_referrer_policy
+      : ""
+  }
+    ${
+      input.link_referrer_policy
+        ? "&link_referrer_policy=" + input.link_referrer_policy
+        : ""
+    }`;
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  // Retrieve the request referrer from the server
+  let referrer_response = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_referrer_policy_html.sjs?action=get_request_referrer_results"
+  ).then(response => response.text());
+
+  Assert.ok(
+    referrer_response === expected_results.referrer,
+    "Request referrer matches expected - " + input.test_name
+  );
+
+  await Assert.deepEqual(
+    gotRequestCount,
+    { hinted: expected_results.hinted, normal: expected_results.normal },
+    `${input.testName} (${input.resource_type}): Unexpected amount of requests made`
+  );
+}
+
+add_task(async function test_103_referrer_policies() {
+  let tests = [
+    {
+      input: {
+        test_name: "image - no policies",
+        resource_type: "image",
+        header_referrer_policy: "",
+        link_referrer_policy: "",
+        hinted: true,
+      },
+      expected: {
+        hinted: 1,
+        normal: 0,
+        referrer:
+          "https://example.com/browser/netwerk/test/browser/early_hint_referrer_policy_html.sjs?as=image&hinted=1",
+      },
+    },
+    {
+      input: {
+        test_name: "image - origin on header",
+        resource_type: "image",
+        header_referrer_policy: "origin",
+        link_referrer_policy: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "https://example.com/" },
+    },
+    {
+      input: {
+        test_name: "image - origin on link",
+        resource_type: "image",
+        header_referrer_policy: "",
+        link_referrer_policy: "origin",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "https://example.com/" },
+    },
+    {
+      input: {
+        test_name: "image - origin on both",
+        resource_type: "image",
+        header_referrer_policy: "origin",
+        link_referrer_policy: "origin",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "https://example.com/" },
+    },
+    {
+      input: {
+        test_name: "image - no-referrer on header",
+        resource_type: "image",
+        header_referrer_policy: "no-referrer",
+        link_referrer_policy: "",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "" },
+    },
+    {
+      input: {
+        test_name: "image - no-referrer on link",
+        resource_type: "image",
+        header_referrer_policy: "",
+        link_referrer_policy: "no-referrer",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "" },
+    },
+    {
+      input: {
+        test_name: "image - no-referrer on both",
+        resource_type: "image",
+        header_referrer_policy: "no-referrer",
+        link_referrer_policy: "no-referrer",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "" },
+    },
+    {
+      // link referrer policy takes precedence
+      input: {
+        test_name: "image - origin on header, no-referrer on link",
+        resource_type: "image",
+        header_referrer_policy: "origin",
+        link_referrer_policy: "no-referrer",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "" },
+    },
+    {
+      // link referrer policy takes precedence
+      input: {
+        test_name: "image - no-referrer on header, origin on link",
+        resource_type: "image",
+        header_referrer_policy: "no-referrer",
+        link_referrer_policy: "origin",
+        hinted: true,
+      },
+      expected: { hinted: 1, normal: 0, referrer: "https://example.com/" },
+    },
+  ];
+
+  for (let test of tests) {
+    await test_referrer_policy(test.input, test.expected);
+  }
+});
diff --git a/netwerk/test/browser/browser_103_telemetry.js b/netwerk/test/browser/browser_103_telemetry.js
new file mode 100644
index 0000000000..bf0f55fc2e
--- /dev/null
+++ b/netwerk/test/browser/browser_103_telemetry.js
@@ -0,0 +1,107 @@
+"use strict";
+
+const { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+Services.prefs.setCharPref("dom.securecontext.allowlist", "example.com");
+
+var kTest103 =
+  "http://example.com/browser/netwerk/test/browser/103_preload.html";
+var kTestNo103 =
+  "http://example.com/browser/netwerk/test/browser/no_103_preload.html";
+var kTest404 =
+  "http://example.com/browser/netwerk/test/browser/103_preload_and_404.html";
+
+add_task(async function () {
+  let hist_hints = TelemetryTestUtils.getAndClearHistogram(
+    "EH_NUM_OF_HINTS_PER_PAGE"
+  );
+  let hist_final = TelemetryTestUtils.getAndClearHistogram("EH_FINAL_RESPONSE");
+  let hist_time = TelemetryTestUtils.getAndClearHistogram(
+    "EH_TIME_TO_FINAL_RESPONSE"
+  );
+
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, kTest103, true);
+
+  // This is a 200 response with 103:
+  // EH_NUM_OF_HINTS_PER_PAGE should record 1.
+  // EH_FINAL_RESPONSE should record 1 on position 0 (R2xx).
+  // EH_TIME_TO_FINAL_RESPONSE should have a new value
+  //   (we cannot determine what the timing will be therefore we only check that
+  //    the histogram sum is > 0).
+  TelemetryTestUtils.assertHistogram(hist_hints, 1, 1);
+  TelemetryTestUtils.assertHistogram(hist_final, 0, 1);
+  const snapshot = hist_time.snapshot();
+  let found = false;
+  for (let [val] of Object.entries(snapshot.values)) {
+    if (val > 0) {
+      found = true;
+    }
+  }
+  Assert.ok(found);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function () {
+  let hist_hints = TelemetryTestUtils.getAndClearHistogram(
+    "EH_NUM_OF_HINTS_PER_PAGE"
+  );
+  let hist_final = TelemetryTestUtils.getAndClearHistogram("EH_FINAL_RESPONSE");
+  let hist_time = TelemetryTestUtils.getAndClearHistogram(
+    "EH_TIME_TO_FINAL_RESPONSE"
+  );
+
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, kTestNo103, true);
+
+  // This is a 200 response without 103:
+  // EH_NUM_OF_HINTS_PER_PAGE should record 0.
+  // EH_FINAL_RESPONSE andd EH_TIME_TO_FINAL_RESPONSE should not be recorded.
+  TelemetryTestUtils.assertHistogram(hist_hints, 0, 1);
+  const snapshot_final = hist_final.snapshot();
+  Assert.equal(snapshot_final.sum, 0);
+  const snapshot_time = hist_time.snapshot();
+  let found = false;
+  for (let [val] of Object.entries(snapshot_time.values)) {
+    if (val > 0) {
+      found = true;
+    }
+  }
+  Assert.ok(!found);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function () {
+  let hist_hints = TelemetryTestUtils.getAndClearHistogram(
+    "EH_NUM_OF_HINTS_PER_PAGE"
+  );
+  let hist_final = TelemetryTestUtils.getAndClearHistogram("EH_FINAL_RESPONSE");
+  let hist_time = TelemetryTestUtils.getAndClearHistogram(
+    "EH_TIME_TO_FINAL_RESPONSE"
+  );
+
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, kTest404, true);
+
+  // This is a 404 response with 103:
+  // EH_NUM_OF_HINTS_PER_PAGE and EH_TIME_TO_FINAL_RESPONSE should not be recorded.
+  // EH_FINAL_RESPONSE should record 1 on index 2 (R4xx).
+  const snapshot_hints = hist_hints.snapshot();
+  Assert.equal(snapshot_hints.sum, 0);
+  TelemetryTestUtils.assertHistogram(hist_final, 2, 1);
+  const snapshot_time = hist_time.snapshot();
+  let found = false;
+  for (let [val] of Object.entries(snapshot_time.values)) {
+    if (val > 0) {
+      found = true;
+    }
+  }
+  Assert.ok(!found);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function cleanup() {
+  Services.prefs.clearUserPref("dom.securecontext.allowlist");
+});
diff --git a/netwerk/test/browser/browser_103_user_load.js b/netwerk/test/browser/browser_103_user_load.js
new file mode 100644
index 0000000000..01c4b71ab2
--- /dev/null
+++ b/netwerk/test/browser/browser_103_user_load.js
@@ -0,0 +1,81 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// simulate user initiated loads by entering the URL in the URL-bar code based on
+// https://searchfox.org/mozilla-central/rev/5644fae86d5122519a0e34ee03117c88c6ed9b47/browser/components/urlbar/tests/browser/browser_enter.js
+
+const {
+  request_count_checking,
+  test_hint_preload_internal,
+  test_hint_preload,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/early_hint_preload_test_helper.sys.mjs"
+);
+
+const START_VALUE =
+  "https://example.com/browser/netwerk/test/browser/early_hint_asset_html.sjs?as=style&hinted=1";
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.suggest.quickactions", false]],
+  });
+});
+
+Services.prefs.setBoolPref("network.early-hints.enabled", true);
+
+// bug 1780822
+add_task(async function user_initiated_load() {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  info("Simple user initiated load");
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  // under normal test conditions using the systemPrincipal as loadingPrincipal
+  // doesn't elicit a crash, changing the behavior for this test:
+  // https://searchfox.org/mozilla-central/rev/5644fae86d5122519a0e34ee03117c88c6ed9b47/dom/security/nsContentSecurityManager.cpp#1149-1150
+  Services.prefs.setBoolPref(
+    "security.disallow_non_local_systemprincipal_in_tests",
+    true
+  );
+
+  gURLBar.value = START_VALUE;
+  gURLBar.focus();
+  EventUtils.synthesizeKey("KEY_Enter");
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  // reset the config option
+  Services.prefs.clearUserPref(
+    "security.disallow_non_local_systemprincipal_in_tests"
+  );
+
+  // Check url bar and selected tab.
+  is(
+    gURLBar.value,
+    START_VALUE,
+    "Urlbar should preserve the value on return keypress"
+  );
+  is(gBrowser.selectedTab, tab, "New URL was loaded in the current tab");
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+  let expectedRequestCount = { hinted: 1, normal: 0 };
+
+  await request_count_checking(
+    "test_preload_user_initiated",
+    gotRequestCount,
+    expectedRequestCount
+  );
+
+  // Cleanup.
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/netwerk/test/browser/browser_NetUtil.js b/netwerk/test/browser/browser_NetUtil.js
new file mode 100644
index 0000000000..99c6eb88cb
--- /dev/null
+++ b/netwerk/test/browser/browser_NetUtil.js
@@ -0,0 +1,111 @@
+/*
+Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/
+*/
+"use strict";
+
+function test() {
+  waitForExplicitFinish();
+
+  // We overload this test to include verifying that httpd.js is
+  // importable as a testing-only JS module.
+  ChromeUtils.import("resource://testing-common/httpd.js");
+
+  nextTest();
+}
+
+function nextTest() {
+  if (tests.length) {
+    executeSoon(tests.shift());
+  } else {
+    executeSoon(finish);
+  }
+}
+
+var tests = [test_asyncFetchBadCert];
+
+function test_asyncFetchBadCert() {
+  // Try a load from an untrusted cert, with errors supressed
+  NetUtil.asyncFetch(
+    {
+      uri: "https://untrusted.example.com",
+      loadUsingSystemPrincipal: true,
+    },
+    function (aInputStream, aStatusCode, aRequest) {
+      ok(!Components.isSuccessCode(aStatusCode), "request failed");
+      ok(aRequest instanceof Ci.nsIHttpChannel, "request is an nsIHttpChannel");
+
+      // Now try again with a channel whose notificationCallbacks doesn't suprress errors
+      let channel = NetUtil.newChannel({
+        uri: "https://untrusted.example.com",
+        loadUsingSystemPrincipal: true,
+      });
+      channel.notificationCallbacks = {
+        QueryInterface: ChromeUtils.generateQI([
+          "nsIProgressEventSink",
+          "nsIInterfaceRequestor",
+        ]),
+        getInterface(aIID) {
+          return this.QueryInterface(aIID);
+        },
+        onProgress() {},
+        onStatus() {},
+      };
+      NetUtil.asyncFetch(
+        channel,
+        function (aInputStream, aStatusCode, aRequest) {
+          ok(!Components.isSuccessCode(aStatusCode), "request failed");
+          ok(
+            aRequest instanceof Ci.nsIHttpChannel,
+            "request is an nsIHttpChannel"
+          );
+
+          // Now try a valid request
+          NetUtil.asyncFetch(
+            {
+              uri: "https://example.com",
+              loadUsingSystemPrincipal: true,
+            },
+            function (aInputStream, aStatusCode, aRequest) {
+              info("aStatusCode for valid request: " + aStatusCode);
+              ok(Components.isSuccessCode(aStatusCode), "request succeeded");
+              ok(
+                aRequest instanceof Ci.nsIHttpChannel,
+                "request is an nsIHttpChannel"
+              );
+              ok(aRequest.requestSucceeded, "HTTP request succeeded");
+
+              nextTest();
+            }
+          );
+        }
+      );
+    }
+  );
+}
+
+function WindowListener(aURL, aCallback) {
+  this.callback = aCallback;
+  this.url = aURL;
+}
+WindowListener.prototype = {
+  onOpenWindow(aXULWindow) {
+    var domwindow = aXULWindow.docShell.domWindow;
+    var self = this;
+    domwindow.addEventListener(
+      "load",
+      function () {
+        if (domwindow.document.location.href != self.url) {
+          return;
+        }
+
+        // Allow other window load listeners to execute before passing to callback
+        executeSoon(function () {
+          self.callback(domwindow);
+        });
+      },
+      { once: true }
+    );
+  },
+  onCloseWindow(aXULWindow) {},
+};
diff --git a/netwerk/test/browser/browser_about_cache.js b/netwerk/test/browser/browser_about_cache.js
new file mode 100644
index 0000000000..9e9b2467d5
--- /dev/null
+++ b/netwerk/test/browser/browser_about_cache.js
@@ -0,0 +1,136 @@
+"use strict";
+
+/**
+ * Open a dummy page, then open about:cache and verify the opened page shows up in the cache.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["privacy.partition.network_state", false]],
+  });
+
+  const kRoot = getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content/",
+    "https://example.com/"
+  );
+  const kTestPage = kRoot + "dummy.html";
+  // Open the dummy page to get it cached.
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    kTestPage,
+    true
+  );
+  BrowserTestUtils.removeTab(tab);
+
+  tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:cache",
+    true
+  );
+  let expectedPageCheck = function (uri) {
+    info("Saw load for " + uri);
+    // Can't easily use searchParms and new URL() because it's an about: URI...
+    return uri.startsWith("about:cache?") && uri.includes("storage=disk");
+  };
+  let diskPageLoaded = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    false,
+    expectedPageCheck
+  );
+  await SpecialPowers.spawn(tab.linkedBrowser, [], function () {
+    ok(
+      !content.document.nodePrincipal.isSystemPrincipal,
+      "about:cache should not have system principal"
+    );
+    let principal = content.document.nodePrincipal;
+    let channel = content.docShell.currentDocumentChannel;
+    ok(!channel.loadInfo.loadingPrincipal, "Loading principal should be null.");
+    is(
+      principal.spec,
+      content.document.location.href,
+      "Principal matches location"
+    );
+    let links = [...content.document.querySelectorAll("a[href*=disk]")];
+    is(links.length, 1, "Should have 1 link to the disk entries");
+    links[0].click();
+  });
+  await diskPageLoaded;
+  info("about:cache disk subpage loaded");
+
+  expectedPageCheck = function (uri) {
+    info("Saw load for " + uri);
+    return uri.startsWith("about:cache-entry") && uri.includes("dummy.html");
+  };
+  let triggeringURISpec = tab.linkedBrowser.currentURI.spec;
+  let entryLoaded = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    false,
+    expectedPageCheck
+  );
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [kTestPage],
+    function (kTestPage) {
+      ok(
+        !content.document.nodePrincipal.isSystemPrincipal,
+        "about:cache with query params should still not have system principal"
+      );
+      let principal = content.document.nodePrincipal;
+      is(
+        principal.spec,
+        content.document.location.href,
+        "Principal matches location"
+      );
+      let channel = content.docShell.currentDocumentChannel;
+      principal = channel.loadInfo.triggeringPrincipal;
+      is(
+        principal.spec,
+        "about:cache",
+        "Triggering principal matches previous location"
+      );
+      ok(
+        !channel.loadInfo.loadingPrincipal,
+        "Loading principal should be null."
+      );
+      let links = [
+        ...content.document.querySelectorAll("a[href*='" + kTestPage + "']"),
+      ];
+      is(links.length, 1, "Should have 1 link to the entry for " + kTestPage);
+      links[0].click();
+    }
+  );
+  await entryLoaded;
+  info("about:cache entry loaded");
+
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [triggeringURISpec],
+    function (triggeringURISpec) {
+      ok(
+        !content.document.nodePrincipal.isSystemPrincipal,
+        "about:cache-entry should also not have system principal"
+      );
+      let principal = content.document.nodePrincipal;
+      is(
+        principal.spec,
+        content.document.location.href,
+        "Principal matches location"
+      );
+      let channel = content.docShell.currentDocumentChannel;
+      principal = channel.loadInfo.triggeringPrincipal;
+      is(
+        principal.spec,
+        triggeringURISpec,
+        "Triggering principal matches previous location"
+      );
+      ok(
+        !channel.loadInfo.loadingPrincipal,
+        "Loading principal should be null."
+      );
+      ok(
+        content.document.querySelectorAll("th").length,
+        "Should have several table headers with data."
+      );
+    }
+  );
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/netwerk/test/browser/browser_backgroundtask_purgeHTTPCache.js b/netwerk/test/browser/browser_backgroundtask_purgeHTTPCache.js
new file mode 100644
index 0000000000..76af1451f5
--- /dev/null
+++ b/netwerk/test/browser/browser_backgroundtask_purgeHTTPCache.js
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+add_task(async function test_startupCleanup() {
+  Services.prefs.setBoolPref(
+    "network.cache.shutdown_purge_in_background_task",
+    true
+  );
+  Services.prefs.setBoolPref("privacy.clearOnShutdown.cache", true);
+  Services.prefs.setBoolPref("privacy.sanitize.sanitizeOnShutdown", true);
+  let dir = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  dir.append("cache2.2021-11-25-08-47-04.purge.bg_rm");
+  Assert.equal(dir.exists(), false, `Folder ${dir.path} should not exist`);
+  dir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o744);
+  Assert.equal(
+    dir.exists(),
+    true,
+    `Folder ${dir.path} should have been created`
+  );
+
+  Services.obs.notifyObservers(null, "browser-delayed-startup-finished");
+
+  await TestUtils.waitForCondition(() => {
+    return !dir.exists();
+  });
+
+  Assert.equal(
+    dir.exists(),
+    false,
+    `Folder ${dir.path} should have been purged by background task`
+  );
+  Services.prefs.clearUserPref(
+    "network.cache.shutdown_purge_in_background_task"
+  );
+  Services.prefs.clearUserPref("privacy.clearOnShutdown.cache");
+  Services.prefs.clearUserPref("privacy.sanitize.sanitizeOnShutdown");
+});
diff --git a/netwerk/test/browser/browser_bug1535877.js b/netwerk/test/browser/browser_bug1535877.js
new file mode 100644
index 0000000000..0bd0a98d11
--- /dev/null
+++ b/netwerk/test/browser/browser_bug1535877.js
@@ -0,0 +1,15 @@
+"use strict";
+
+add_task(_ => {
+  try {
+    Cc["@mozilla.org/network/effective-tld-service;1"].createInstance(
+      Ci.nsISupports
+    );
+  } catch (e) {
+    is(
+      e.result,
+      Cr.NS_ERROR_XPC_CI_RETURNED_FAILURE,
+      "Component creation as an instance fails with expected code"
+    );
+  }
+});
diff --git a/netwerk/test/browser/browser_bug1629307.js b/netwerk/test/browser/browser_bug1629307.js
new file mode 100644
index 0000000000..de2af5f948
--- /dev/null
+++ b/netwerk/test/browser/browser_bug1629307.js
@@ -0,0 +1,81 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// Load a web page containing an iframe that requires authentication but includes the X-Frame-Options: SAMEORIGIN header.
+// Make sure that we don't needlessly show an authentication prompt for it.
+
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+add_task(async function () {
+  SpecialPowers.pushPrefEnv({
+    set: [["network.auth.supress_auth_prompt_for_XFO_failures", true]],
+  });
+
+  let URL =
+    "https://example.com/browser/netwerk/test/browser/test_1629307.html";
+
+  let hasPrompt = false;
+
+  PromptTestUtils.handleNextPrompt(
+    window,
+    {
+      modalType: Services.prefs.getIntPref("prompts.modalType.httpAuth"),
+      promptType: "promptUserAndPass",
+    },
+    { buttonNumClick: 1 }
+  )
+    .then(function () {
+      hasPrompt = true;
+    })
+    .catch(function () {});
+
+  BrowserTestUtils.loadURIString(gBrowser.selectedBrowser, URL);
+
+  // wait until the page and its iframe page is loaded
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser, true, URL);
+
+  Assert.equal(
+    hasPrompt,
+    false,
+    "no prompt when loading page via iframe with x-auth options"
+  );
+});
+
+add_task(async function () {
+  SpecialPowers.pushPrefEnv({
+    set: [["network.auth.supress_auth_prompt_for_XFO_failures", false]],
+  });
+
+  let URL =
+    "https://example.com/browser/netwerk/test/browser/test_1629307.html";
+
+  let hasPrompt = false;
+
+  PromptTestUtils.handleNextPrompt(
+    window,
+    {
+      modalType: Services.prefs.getIntPref("prompts.modalType.httpAuth"),
+      promptType: "promptUserAndPass",
+    },
+    { buttonNumClick: 1 }
+  )
+    .then(function () {
+      hasPrompt = true;
+    })
+    .catch(function () {});
+
+  BrowserTestUtils.loadURIString(gBrowser.selectedBrowser, URL);
+
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser, true, URL);
+
+  Assert.equal(
+    hasPrompt,
+    true,
+    "prompt when loading page via iframe with x-auth options with pref network.auth.supress_auth_prompt_for_XFO_failures disabled"
+  );
+});
diff --git a/netwerk/test/browser/browser_child_resource.js b/netwerk/test/browser/browser_child_resource.js
new file mode 100644
index 0000000000..341a8fc8e3
--- /dev/null
+++ b/netwerk/test/browser/browser_child_resource.js
@@ -0,0 +1,246 @@
+/*
+Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/
+*/
+"use strict";
+
+// This must be loaded in the remote process for this test to be useful
+const TEST_URL = "https://example.com/browser/netwerk/test/browser/dummy.html";
+
+const expectedRemote = gMultiProcessBrowser ? "true" : "";
+
+const resProtocol = Cc[
+  "@mozilla.org/network/protocol;1?name=resource"
+].getService(Ci.nsIResProtocolHandler);
+
+function waitForEvent(obj, name, capturing, chromeEvent) {
+  info("Waiting for " + name);
+  return new Promise(resolve => {
+    function listener(event) {
+      info("Saw " + name);
+      obj.removeEventListener(name, listener, capturing, chromeEvent);
+      resolve(event);
+    }
+
+    obj.addEventListener(name, listener, capturing, chromeEvent);
+  });
+}
+
+function resolveURI(uri) {
+  uri = Services.io.newURI(uri);
+  try {
+    return resProtocol.resolveURI(uri);
+  } catch (e) {
+    return null;
+  }
+}
+
+function remoteResolveURI(uri) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [uri], uriToResolve => {
+    let resProtocol = Cc[
+      "@mozilla.org/network/protocol;1?name=resource"
+    ].getService(Ci.nsIResProtocolHandler);
+
+    uriToResolve = Services.io.newURI(uriToResolve);
+    try {
+      return resProtocol.resolveURI(uriToResolve);
+    } catch (e) {}
+    return null;
+  });
+}
+
+// Restarts the child process by crashing it then reloading the tab
+var restart = async function () {
+  let browser = gBrowser.selectedBrowser;
+  // If the tab isn't remote this would crash the main process so skip it
+  if (browser.getAttribute("remote") != "true") {
+    return browser;
+  }
+
+  await BrowserTestUtils.crashFrame(browser);
+
+  browser.reload();
+
+  await BrowserTestUtils.browserLoaded(browser);
+  is(
+    browser.getAttribute("remote"),
+    expectedRemote,
+    "Browser should be in the right process"
+  );
+  return browser;
+};
+
+// Sanity check that this test is going to be useful
+add_task(async function () {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  // This must be loaded in the remote process for this test to be useful
+  is(
+    gBrowser.selectedBrowser.getAttribute("remote"),
+    expectedRemote,
+    "Browser should be in the right process"
+  );
+
+  let local = resolveURI("resource://gre/modules/AppConstants.jsm");
+  let remote = await remoteResolveURI(
+    "resource://gre/modules/AppConstants.jsm"
+  );
+  is(local, remote, "AppConstants.jsm should resolve in both processes");
+
+  gBrowser.removeCurrentTab();
+});
+
+// Add a mapping, update it then remove it
+add_task(async function () {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  info("Set");
+  resProtocol.setSubstitution(
+    "testing",
+    Services.io.newURI("chrome://global/content")
+  );
+  let local = resolveURI("resource://testing/test.js");
+  let remote = await remoteResolveURI("resource://testing/test.js");
+  is(
+    local,
+    "chrome://global/content/test.js",
+    "Should resolve in main process"
+  );
+  is(
+    remote,
+    "chrome://global/content/test.js",
+    "Should resolve in child process"
+  );
+
+  info("Change");
+  resProtocol.setSubstitution(
+    "testing",
+    Services.io.newURI("chrome://global/skin")
+  );
+  local = resolveURI("resource://testing/test.js");
+  remote = await remoteResolveURI("resource://testing/test.js");
+  is(local, "chrome://global/skin/test.js", "Should resolve in main process");
+  is(remote, "chrome://global/skin/test.js", "Should resolve in child process");
+
+  info("Clear");
+  resProtocol.setSubstitution("testing", null);
+  local = resolveURI("resource://testing/test.js");
+  remote = await remoteResolveURI("resource://testing/test.js");
+  is(local, null, "Shouldn't resolve in main process");
+  is(remote, null, "Shouldn't resolve in child process");
+
+  gBrowser.removeCurrentTab();
+});
+
+// Add a mapping, restart the child process then check it is still there
+add_task(async function () {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  info("Set");
+  resProtocol.setSubstitution(
+    "testing",
+    Services.io.newURI("chrome://global/content")
+  );
+  let local = resolveURI("resource://testing/test.js");
+  let remote = await remoteResolveURI("resource://testing/test.js");
+  is(
+    local,
+    "chrome://global/content/test.js",
+    "Should resolve in main process"
+  );
+  is(
+    remote,
+    "chrome://global/content/test.js",
+    "Should resolve in child process"
+  );
+
+  await restart();
+
+  local = resolveURI("resource://testing/test.js");
+  remote = await remoteResolveURI("resource://testing/test.js");
+  is(
+    local,
+    "chrome://global/content/test.js",
+    "Should resolve in main process"
+  );
+  is(
+    remote,
+    "chrome://global/content/test.js",
+    "Should resolve in child process"
+  );
+
+  info("Change");
+  resProtocol.setSubstitution(
+    "testing",
+    Services.io.newURI("chrome://global/skin")
+  );
+
+  await restart();
+
+  local = resolveURI("resource://testing/test.js");
+  remote = await remoteResolveURI("resource://testing/test.js");
+  is(local, "chrome://global/skin/test.js", "Should resolve in main process");
+  is(remote, "chrome://global/skin/test.js", "Should resolve in child process");
+
+  info("Clear");
+  resProtocol.setSubstitution("testing", null);
+
+  await restart();
+
+  local = resolveURI("resource://testing/test.js");
+  remote = await remoteResolveURI("resource://testing/test.js");
+  is(local, null, "Shouldn't resolve in main process");
+  is(remote, null, "Shouldn't resolve in child process");
+
+  gBrowser.removeCurrentTab();
+});
+
+// Adding a mapping to a resource URI should work
+add_task(async function () {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+
+  info("Set");
+  resProtocol.setSubstitution(
+    "testing",
+    Services.io.newURI("chrome://global/content")
+  );
+  resProtocol.setSubstitution(
+    "testing2",
+    Services.io.newURI("resource://testing")
+  );
+  let local = resolveURI("resource://testing2/test.js");
+  let remote = await remoteResolveURI("resource://testing2/test.js");
+  is(
+    local,
+    "chrome://global/content/test.js",
+    "Should resolve in main process"
+  );
+  is(
+    remote,
+    "chrome://global/content/test.js",
+    "Should resolve in child process"
+  );
+
+  info("Clear");
+  resProtocol.setSubstitution("testing", null);
+  local = resolveURI("resource://testing2/test.js");
+  remote = await remoteResolveURI("resource://testing2/test.js");
+  is(
+    local,
+    "chrome://global/content/test.js",
+    "Should resolve in main process"
+  );
+  is(
+    remote,
+    "chrome://global/content/test.js",
+    "Should resolve in child process"
+  );
+
+  resProtocol.setSubstitution("testing2", null);
+  local = resolveURI("resource://testing2/test.js");
+  remote = await remoteResolveURI("resource://testing2/test.js");
+  is(local, null, "Shouldn't resolve in main process");
+  is(remote, null, "Shouldn't resolve in child process");
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/netwerk/test/browser/browser_cookie_filtering_basic.js b/netwerk/test/browser/browser_cookie_filtering_basic.js
new file mode 100644
index 0000000000..e51bed5bc5
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_filtering_basic.js
@@ -0,0 +1,184 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+const {
+  HTTPS_EXAMPLE_ORG,
+  HTTPS_EXAMPLE_COM,
+  HTTP_EXAMPLE_COM,
+  browserTestPath,
+  waitForAllExpectedTests,
+  cleanupObservers,
+  checkExpectedCookies,
+  fetchHelper,
+  preclean_test,
+  cleanup_test,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/cookie_filtering_helper.sys.mjs"
+);
+
+// run suite with content listener
+// 1. initializes the content process and observer
+// 2. runs the test gamut
+// 3. cleans up the content process
+async function runSuiteWithContentListener(name, triggerSuiteFunc, expected) {
+  return async function (browser) {
+    info("Running content suite: " + name);
+    await SpecialPowers.spawn(browser, [expected, name], checkExpectedCookies);
+    await triggerSuiteFunc();
+    await SpecialPowers.spawn(browser, [], waitForAllExpectedTests);
+    await SpecialPowers.spawn(browser, [], cleanupObservers);
+    info("Complete content suite: " + name);
+  };
+}
+
+// TEST: Different domains (org)
+// * example.org cookies go to example.org process
+// * exmaple.com cookies do not go to example.org process
+async function test_basic_suite_org() {
+  // example.org - start content process when loading page
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_ORG),
+    },
+    await runSuiteWithContentListener(
+      "basic suite org",
+      triggerBasicSuite,
+      basicSuiteMatchingDomain(HTTPS_EXAMPLE_ORG)
+    )
+  );
+}
+
+// TEST: Different domains (com)
+// * example.com cookies go to example.com process
+// * example.org cookies do not go to example.com process
+// * insecure example.com cookies go to secure com process
+async function test_basic_suite_com() {
+  // example.com - start content process when loading page
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "basic suite com",
+      triggerBasicSuite,
+      basicSuiteMatchingDomain(HTTPS_EXAMPLE_COM).concat(
+        basicSuiteMatchingDomain(HTTP_EXAMPLE_COM)
+      )
+    )
+  );
+}
+
+// TEST: Duplicate domain (org)
+// * example.org cookies go to multiple example.org processes
+async function test_basic_suite_org_duplicate() {
+  let expected = basicSuiteMatchingDomain(HTTPS_EXAMPLE_ORG);
+  let t1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    browserTestPath(HTTPS_EXAMPLE_ORG)
+  );
+  let testStruct1 = {
+    name: "example.org primary",
+    browser: gBrowser.getBrowserForTab(t1),
+    tab: t1,
+    expected,
+  };
+
+  // example.org dup
+  let t3 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    browserTestPath(HTTPS_EXAMPLE_ORG)
+  );
+  let testStruct3 = {
+    name: "example.org dup",
+    browser: gBrowser.getBrowserForTab(t3),
+    tab: t3,
+    expected,
+  };
+
+  let parentpid = Services.appinfo.processID;
+  let pid1 = testStruct1.browser.frameLoader.remoteTab.osPid;
+  let pid3 = testStruct3.browser.frameLoader.remoteTab.osPid;
+  ok(
+    parentpid != pid1,
+    "Parent pid should differ from content process for 1st example.org"
+  );
+  ok(
+    parentpid != pid3,
+    "Parent pid should differ from content process for 2nd example.org"
+  );
+  ok(pid1 != pid3, "Content pids should differ from each other");
+
+  await SpecialPowers.spawn(
+    testStruct1.browser,
+    [testStruct1.expected, testStruct1.name],
+    checkExpectedCookies
+  );
+
+  await SpecialPowers.spawn(
+    testStruct3.browser,
+    [testStruct3.expected, testStruct3.name],
+    checkExpectedCookies
+  );
+
+  await triggerBasicSuite();
+
+  // wait for all tests and cleanup
+  await SpecialPowers.spawn(testStruct1.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct3.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct1.browser, [], cleanupObservers);
+  await SpecialPowers.spawn(testStruct3.browser, [], cleanupObservers);
+  BrowserTestUtils.removeTab(testStruct1.tab);
+  BrowserTestUtils.removeTab(testStruct3.tab);
+}
+
+function basicSuite() {
+  var suite = [];
+  suite.push(["test-cookie=aaa", HTTPS_EXAMPLE_ORG]);
+  suite.push(["test-cookie=bbb", HTTPS_EXAMPLE_ORG]);
+  suite.push(["test-cookie=dad", HTTPS_EXAMPLE_ORG]);
+  suite.push(["test-cookie=rad", HTTPS_EXAMPLE_ORG]);
+  suite.push(["test-cookie=orgwontsee", HTTPS_EXAMPLE_COM]);
+  suite.push(["test-cookie=sentinelorg", HTTPS_EXAMPLE_ORG]);
+  suite.push(["test-cookie=sentinelcom", HTTPS_EXAMPLE_COM]);
+  return suite;
+}
+
+function basicSuiteMatchingDomain(domain) {
+  var suite = basicSuite();
+  var result = [];
+  for (var [cookie, dom] of suite) {
+    if (dom == domain) {
+      result.push(cookie);
+    }
+  }
+  return result;
+}
+
+// triggers set-cookie, which will trigger cookie-changed messages
+// messages will be filtered against the cookie list created from above
+// only unfiltered messages should make it to the content process
+async function triggerBasicSuite() {
+  let triggerCookies = basicSuite();
+  for (var [cookie, domain] of triggerCookies) {
+    let secure = false;
+    if (domain.includes("https")) {
+      secure = true;
+    }
+
+    //trigger
+    var url = browserTestPath(domain) + "cookie_filtering_resource.sjs";
+    await fetchHelper(url, cookie, secure);
+  }
+}
+
+add_task(preclean_test);
+add_task(test_basic_suite_org); // 5
+add_task(test_basic_suite_com); // 2
+add_task(test_basic_suite_org_duplicate); // 13
+add_task(cleanup_test);
diff --git a/netwerk/test/browser/browser_cookie_filtering_cross_origin.js b/netwerk/test/browser/browser_cookie_filtering_cross_origin.js
new file mode 100644
index 0000000000..5a722846ef
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_filtering_cross_origin.js
@@ -0,0 +1,146 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+"use strict";
+
+const {
+  HTTPS_EXAMPLE_ORG,
+  HTTPS_EXAMPLE_COM,
+  HTTP_EXAMPLE_COM,
+  browserTestPath,
+  waitForAllExpectedTests,
+  cleanupObservers,
+  checkExpectedCookies,
+  preclean_test,
+  cleanup_test,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/cookie_filtering_helper.sys.mjs"
+);
+
+async function runSuiteWithContentListener(name, trigger_suite_func, expected) {
+  return async function (browser) {
+    info("Running content suite: " + name);
+    await SpecialPowers.spawn(browser, [expected, name], checkExpectedCookies);
+    await trigger_suite_func();
+    await SpecialPowers.spawn(browser, [], waitForAllExpectedTests);
+    await SpecialPowers.spawn(browser, [], cleanupObservers);
+    info("Complete content suite: " + name);
+  };
+}
+
+// TEST: Cross Origin Resource (com)
+// * process receives only COR cookies pertaining to same page
+async function test_cross_origin_resource_com() {
+  let comExpected = [];
+  comExpected.push("test-cookie=comhtml"); // 1
+  comExpected.push("test-cookie=png"); // 2
+  comExpected.push("test-cookie=orghtml"); // 3
+  // nothing for 4, 5, 6, 7 -> goes to .org process
+  comExpected.push("test-cookie=png"); // 8
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "COR example.com",
+      triggerCrossOriginSuite,
+      comExpected
+    )
+  );
+  Services.cookies.removeAll();
+}
+
+// TEST: Cross Origin Resource (org)
+// * received COR cookies only pertaining to the process's page
+async function test_cross_origin_resource_org() {
+  let orgExpected = [];
+  // nothing for 1, 2 and 3 -> goes to .com
+  orgExpected.push("test-cookie=png"); // 4
+  orgExpected.push("test-cookie=orghtml"); // 5
+  orgExpected.push("test-cookie=png"); // 6
+  orgExpected.push("test-cookie=comhtml"); // 7
+  // 8 nothing for 8 -> goes to .com process
+  orgExpected.push("test-cookie=png"); // 9. Sentinel to verify no more came in
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_ORG),
+    },
+    await runSuiteWithContentListener(
+      "COR example.org",
+      triggerCrossOriginSuite,
+      orgExpected
+    )
+  );
+}
+
+// seems to block better than fetch for secondary resource
+// using for more predicatable recving
+async function requestBrowserPageWithFilename(
+  testName,
+  requestFrom,
+  filename,
+  param = ""
+) {
+  let url = requestFrom + "/browser/netwerk/test/browser/" + filename;
+
+  // add param if necessary
+  if (param != "") {
+    url += "?" + param;
+  }
+
+  info("requesting " + url + " (" + testName + ")");
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url,
+    },
+    async () => {}
+  );
+}
+
+async function triggerCrossOriginSuite() {
+  // SameSite - 1 com page, 2 com png
+  await requestBrowserPageWithFilename(
+    "SameSite resource (com)",
+    HTTPS_EXAMPLE_COM,
+    "cookie_filtering_secure_resource_com.html"
+  );
+
+  // COR - 3 com page, 4 org png
+  await requestBrowserPageWithFilename(
+    "COR (com-org)",
+    HTTPS_EXAMPLE_COM,
+    "cookie_filtering_secure_resource_org.html"
+  );
+
+  // SameSite - 5 org page, 6 org png
+  await requestBrowserPageWithFilename(
+    "SameSite resource (org)",
+    HTTPS_EXAMPLE_ORG,
+    "cookie_filtering_secure_resource_org.html"
+  );
+
+  // COR - 7 org page, 8 com png
+  await requestBrowserPageWithFilename(
+    "SameSite resource (org-com)",
+    HTTPS_EXAMPLE_ORG,
+    "cookie_filtering_secure_resource_com.html"
+  );
+
+  // Sentinel to verify no more cookies come in after last true test
+  await requestBrowserPageWithFilename(
+    "COR sentinel",
+    HTTPS_EXAMPLE_ORG,
+    "cookie_filtering_square.png"
+  );
+}
+
+add_task(preclean_test);
+add_task(test_cross_origin_resource_com); // 4
+add_task(test_cross_origin_resource_org); // 5
+add_task(cleanup_test);
diff --git a/netwerk/test/browser/browser_cookie_filtering_insecure.js b/netwerk/test/browser/browser_cookie_filtering_insecure.js
new file mode 100644
index 0000000000..679bfc5a56
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_filtering_insecure.js
@@ -0,0 +1,106 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+"use strict";
+
+const {
+  HTTPS_EXAMPLE_ORG,
+  HTTPS_EXAMPLE_COM,
+  HTTP_EXAMPLE_COM,
+  browserTestPath,
+  waitForAllExpectedTests,
+  cleanupObservers,
+  checkExpectedCookies,
+  fetchHelper,
+  preclean_test,
+  cleanup_test,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/cookie_filtering_helper.sys.mjs"
+);
+
+async function runSuiteWithContentListener(name, trigger_suite_func, expected) {
+  return async function (browser) {
+    info("Running content suite: " + name);
+    await SpecialPowers.spawn(browser, [expected, name], checkExpectedCookies);
+    await trigger_suite_func();
+    await SpecialPowers.spawn(browser, [], waitForAllExpectedTests);
+    await SpecialPowers.spawn(browser, [], cleanupObservers);
+    info("Complete content suite: " + name);
+  };
+}
+
+// TEST: In/Secure (insecure com)
+// * secure example.com cookie do not go to insecure example.com process
+// * insecure cookies go to insecure process
+// * secure request with insecure cookie will go to insecure process
+async function test_insecure_suite_insecure_com() {
+  var expected = [];
+  expected.push("test-cookie=png1");
+  expected.push("test-cookie=png2");
+  // insecure com will not recieve the secure com request with secure cookie
+  expected.push(""); // insecure com will lose visibility of secure com cookie
+  expected.push("test-cookie=png3");
+  info(expected);
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTP_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "insecure suite insecure com",
+      triggerInsecureSuite,
+      expected
+    )
+  );
+}
+
+// TEST: In/Secure (secure com)
+// * secure page will recieve all secure/insecure cookies
+async function test_insecure_suite_secure_com() {
+  var expected = [];
+  expected.push("test-cookie=png1");
+  expected.push("test-cookie=png2");
+  expected.push("test-cookie=secure-png");
+  expected.push("test-cookie=png3");
+  info(expected);
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "insecure suite secure com",
+      triggerInsecureSuite,
+      expected
+    )
+  );
+}
+
+async function triggerInsecureSuite() {
+  const cookieSjsFilename = "cookie_filtering_resource.sjs";
+
+  // insecure page, insecure cookie
+  var url = browserTestPath(HTTP_EXAMPLE_COM) + cookieSjsFilename;
+  await fetchHelper(url, "test-cookie=png1", false);
+
+  // secure page req, insecure cookie
+  url = browserTestPath(HTTPS_EXAMPLE_COM) + cookieSjsFilename;
+  await fetchHelper(url, "test-cookie=png2", false);
+
+  // secure page, secure cookie
+  url = browserTestPath(HTTPS_EXAMPLE_COM) + cookieSjsFilename;
+  await fetchHelper(url, "test-cookie=secure-png", true);
+
+  // not testing insecure server returning secure cookie --
+
+  // sentinel
+  url = browserTestPath(HTTPS_EXAMPLE_COM) + cookieSjsFilename;
+  await fetchHelper(url, "test-cookie=png3", false);
+}
+
+add_task(preclean_test);
+add_task(test_insecure_suite_insecure_com); // 3
+add_task(test_insecure_suite_secure_com); // 4
+add_task(cleanup_test);
diff --git a/netwerk/test/browser/browser_cookie_filtering_oa.js b/netwerk/test/browser/browser_cookie_filtering_oa.js
new file mode 100644
index 0000000000..f69ad09e81
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_filtering_oa.js
@@ -0,0 +1,190 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+const {
+  HTTPS_EXAMPLE_ORG,
+  HTTPS_EXAMPLE_COM,
+  HTTP_EXAMPLE_COM,
+  browserTestPath,
+  waitForAllExpectedTests,
+  cleanupObservers,
+  checkExpectedCookies,
+  triggerSetCookieFromHttp,
+  triggerSetCookieFromHttpPrivate,
+  preclean_test,
+  cleanup_test,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/cookie_filtering_helper.sys.mjs"
+);
+
+// TEST: OriginAttributes
+// * example.com OA-changed cookies don't go to example.com & vice-versa
+async function test_origin_attributes() {
+  var suite = oaSuite();
+
+  // example.com - start content process when loading page
+  let t2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    browserTestPath(HTTPS_EXAMPLE_COM)
+  );
+  let testStruct2 = {
+    name: "OA example.com",
+    browser: gBrowser.getBrowserForTab(t2),
+    tab: t2,
+    expected: [suite[0], suite[4]],
+  };
+
+  // open a tab with altered OA: userContextId
+  let t4 = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: (function () {
+      return function () {
+        // info("calling addTab from lambda");
+        gBrowser.selectedTab = BrowserTestUtils.addTab(
+          gBrowser,
+          HTTPS_EXAMPLE_COM,
+          { userContextId: 1 }
+        );
+      };
+    })(),
+  });
+  let testStruct4 = {
+    name: "OA example.com (contextId)",
+    browser: gBrowser.getBrowserForTab(t4),
+    tab: t4,
+    expected: [suite[2], suite[5]],
+  };
+
+  // example.com
+  await SpecialPowers.spawn(
+    testStruct2.browser,
+    [testStruct2.expected, testStruct2.name],
+    checkExpectedCookies
+  );
+  // example.com with different OA: userContextId
+  await SpecialPowers.spawn(
+    testStruct4.browser,
+    [testStruct4.expected, testStruct4.name],
+    checkExpectedCookies
+  );
+
+  await triggerOriginAttributesEmulatedSuite();
+
+  await SpecialPowers.spawn(testStruct2.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct4.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct2.browser, [], cleanupObservers);
+  await SpecialPowers.spawn(testStruct4.browser, [], cleanupObservers);
+  BrowserTestUtils.removeTab(testStruct2.tab);
+  BrowserTestUtils.removeTab(testStruct4.tab);
+}
+
+// TEST: Private
+// * example.com private cookies don't go to example.com process & vice-v
+async function test_private() {
+  var suite = oaSuite();
+
+  // example.com
+  let t2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    browserTestPath(HTTPS_EXAMPLE_COM)
+  );
+  let testStruct2 = {
+    name: "non-priv example.com",
+    browser: gBrowser.getBrowserForTab(t2),
+    tab: t2,
+    expected: [suite[0], suite[4]],
+  };
+
+  // private window example.com
+  let privateBrowserWindow = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  let privateTab = (privateBrowserWindow.gBrowser.selectedTab =
+    BrowserTestUtils.addTab(
+      privateBrowserWindow.gBrowser,
+      browserTestPath(HTTPS_EXAMPLE_COM)
+    ));
+  let testStruct5 = {
+    name: "private example.com",
+    browser: privateBrowserWindow.gBrowser.getBrowserForTab(privateTab),
+    tab: privateTab,
+    expected: [suite[3], suite[6]],
+  };
+  await BrowserTestUtils.browserLoaded(testStruct5.tab.linkedBrowser);
+
+  let parentpid = Services.appinfo.processID;
+  let privatePid = testStruct5.browser.frameLoader.remoteTab.osPid;
+  let pid = testStruct2.browser.frameLoader.remoteTab.osPid;
+  ok(parentpid != privatePid, "Parent and private processes are unique");
+  ok(parentpid != pid, "Parent and non-private processes are unique");
+  ok(privatePid != pid, "Private and non-private processes are unique");
+
+  // example.com
+  await SpecialPowers.spawn(
+    testStruct2.browser,
+    [testStruct2.expected, testStruct2.name],
+    checkExpectedCookies
+  );
+
+  // example.com private
+  await SpecialPowers.spawn(
+    testStruct5.browser,
+    [testStruct5.expected, testStruct5.name],
+    checkExpectedCookies
+  );
+
+  await triggerOriginAttributesEmulatedSuite();
+
+  // wait for all tests and cleanup
+  await SpecialPowers.spawn(testStruct2.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct5.browser, [], waitForAllExpectedTests);
+  await SpecialPowers.spawn(testStruct2.browser, [], cleanupObservers);
+  await SpecialPowers.spawn(testStruct5.browser, [], cleanupObservers);
+  BrowserTestUtils.removeTab(testStruct2.tab);
+  BrowserTestUtils.removeTab(testStruct5.tab);
+  await BrowserTestUtils.closeWindow(privateBrowserWindow);
+}
+
+function oaSuite() {
+  var suite = [];
+  suite.push("test-cookie=orgwontsee"); // 0
+  suite.push("test-cookie=firstparty"); // 1
+  suite.push("test-cookie=usercontext"); // 2
+  suite.push("test-cookie=privateonly"); // 3
+  suite.push("test-cookie=sentinelcom"); // 4
+  suite.push("test-cookie=sentineloa"); // 5
+  suite.push("test-cookie=sentinelprivate"); // 6
+  return suite;
+}
+
+// emulated because we are not making actual page requests
+// we are just directly invoking the api
+async function triggerOriginAttributesEmulatedSuite() {
+  var suite = oaSuite();
+
+  let uriCom = NetUtil.newURI(HTTPS_EXAMPLE_COM);
+  triggerSetCookieFromHttp(uriCom, suite[0]);
+
+  // FPD (OA) changed
+  triggerSetCookieFromHttp(uriCom, suite[1], "foo.com");
+
+  // context id (OA) changed
+  triggerSetCookieFromHttp(uriCom, suite[2], "", 1);
+
+  // private
+  triggerSetCookieFromHttpPrivate(uriCom, suite[3]);
+
+  // sentinels
+  triggerSetCookieFromHttp(uriCom, suite[4]);
+  triggerSetCookieFromHttp(uriCom, suite[5], "", 1);
+  triggerSetCookieFromHttpPrivate(uriCom, suite[6]);
+}
+
+add_task(preclean_test);
+add_task(test_origin_attributes); // 4
+add_task(test_private); // 7
+add_task(cleanup_test);
diff --git a/netwerk/test/browser/browser_cookie_filtering_subdomain.js b/netwerk/test/browser/browser_cookie_filtering_subdomain.js
new file mode 100644
index 0000000000..78fcdb07dd
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_filtering_subdomain.js
@@ -0,0 +1,175 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+const {
+  HTTPS_EXAMPLE_ORG,
+  HTTPS_EXAMPLE_COM,
+  HTTP_EXAMPLE_COM,
+  browserTestPath,
+  waitForAllExpectedTests,
+  cleanupObservers,
+  checkExpectedCookies,
+  fetchHelper,
+  preclean_test,
+  cleanup_test,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/cookie_filtering_helper.sys.mjs"
+);
+
+const HTTPS_SUBDOMAIN_1_EXAMPLE_COM = "https://test1.example.com";
+const HTTP_SUBDOMAIN_1_EXAMPLE_COM = "http://test1.example.com";
+const HTTPS_SUBDOMAIN_2_EXAMPLE_COM = "https://test2.example.com";
+const HTTP_SUBDOMAIN_2_EXAMPLE_COM = "http://test2.example.com";
+
+// run suite with content listener
+// 1. initializes the content process and observer
+// 2. runs the test gamut
+// 3. cleans up the content process
+async function runSuiteWithContentListener(name, triggerSuiteFunc, expected) {
+  return async function (browser) {
+    info("Running content suite: " + name);
+    await SpecialPowers.spawn(browser, [expected, name], checkExpectedCookies);
+    await triggerSuiteFunc();
+    await SpecialPowers.spawn(browser, [], waitForAllExpectedTests);
+    await SpecialPowers.spawn(browser, [], cleanupObservers);
+    info("Complete content suite: " + name);
+  };
+}
+
+// TEST: domain receives subdomain cookies
+async function test_domain() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "test_domain",
+      triggerSuite,
+      cookiesFromSuite()
+    )
+  );
+}
+
+// TEST: insecure domain receives base and sub-domain insecure cookies
+async function test_insecure_domain() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTP_EXAMPLE_COM),
+    },
+
+    await runSuiteWithContentListener("test_insecure_domain", triggerSuite, [
+      "",
+      "", // HTTPS fetch cookies show as empty strings
+      "test-cookie-insecure=insecure_domain",
+      "test-cookie-insecure=insecure_subdomain",
+      "",
+    ])
+  );
+}
+
+// TEST: subdomain receives base domain and other sub-domain cookies
+async function test_subdomain() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTPS_SUBDOMAIN_2_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "test_subdomain",
+      triggerSuite,
+      cookiesFromSuite()
+    )
+  );
+}
+
+// TEST: insecure subdomain receives base and sub-domain insecure cookies
+async function test_insecure_subdomain() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: browserTestPath(HTTP_SUBDOMAIN_2_EXAMPLE_COM),
+    },
+    await runSuiteWithContentListener(
+      "test_insecure_subdomain",
+      triggerSuite,
+
+      [
+        "",
+        "", // HTTPS fetch cookies show as empty strings
+        "test-cookie-insecure=insecure_domain",
+        "test-cookie-insecure=insecure_subdomain",
+        "",
+      ]
+    )
+  );
+}
+
+function suite() {
+  var suite = [];
+  suite.push(["test-cookie=domain", HTTPS_EXAMPLE_COM]);
+  suite.push(["test-cookie=subdomain", HTTPS_SUBDOMAIN_1_EXAMPLE_COM]);
+  suite.push(["test-cookie-insecure=insecure_domain", HTTP_EXAMPLE_COM]);
+  suite.push([
+    "test-cookie-insecure=insecure_subdomain",
+    HTTP_SUBDOMAIN_1_EXAMPLE_COM,
+  ]);
+  suite.push(["test-cookie=sentinel", HTTPS_EXAMPLE_COM]);
+  return suite;
+}
+
+function cookiesFromSuite() {
+  var cookies = [];
+  for (var [cookie] of suite()) {
+    cookies.push(cookie);
+  }
+  return cookies;
+}
+
+function cookiesMatchingDomain(domain) {
+  var s = suite();
+  var result = [];
+  for (var [cookie, dom] of s) {
+    if (dom == domain) {
+      result.push(cookie);
+    }
+  }
+  return result;
+}
+
+function justSitename(maybeSchemefulMaybeSubdomainSite) {
+  let mssArray = maybeSchemefulMaybeSubdomainSite.split("://");
+  let maybesubdomain = mssArray[mssArray.length - 1];
+  let msdArray = maybesubdomain.split(".");
+  return msdArray.slice(msdArray.length - 2, msdArray.length).join(".");
+}
+
+// triggers set-cookie, which will trigger cookie-changed messages
+// messages will be filtered against the cookie list created from above
+// only unfiltered messages should make it to the content process
+async function triggerSuite() {
+  let triggerCookies = suite();
+  for (var [cookie, schemefulDomain] of triggerCookies) {
+    let secure = false;
+    if (schemefulDomain.includes("https")) {
+      secure = true;
+    }
+
+    var url =
+      browserTestPath(schemefulDomain) + "cookie_filtering_resource.sjs";
+    await fetchHelper(url, cookie, secure, justSitename(schemefulDomain));
+    Services.cookies.removeAll(); // clean cookies across secure/insecure runs
+  }
+}
+
+add_task(preclean_test);
+add_task(test_domain); // 5
+add_task(test_insecure_domain); // 2
+add_task(test_subdomain); // 5
+add_task(test_insecure_subdomain); // 2
+add_task(cleanup_test);
diff --git a/netwerk/test/browser/browser_cookie_sync_across_tabs.js b/netwerk/test/browser/browser_cookie_sync_across_tabs.js
new file mode 100644
index 0000000000..127bb2555b
--- /dev/null
+++ b/netwerk/test/browser/browser_cookie_sync_across_tabs.js
@@ -0,0 +1,79 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+add_task(async function () {
+  info("Make sure cookie changes in one process are visible in the other");
+
+  const kRoot = getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content/",
+    "https://example.com/"
+  );
+  const kTestPage = kRoot + "dummy.html";
+
+  Services.cookies.removeAll();
+
+  let tab1 = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    url: kTestPage,
+    forceNewProcess: true,
+  });
+  let tab2 = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    url: kTestPage,
+    forceNewProcess: true,
+  });
+
+  let browser1 = gBrowser.getBrowserForTab(tab1);
+  let browser2 = gBrowser.getBrowserForTab(tab2);
+
+  let pid1 = browser1.frameLoader.remoteTab.osPid;
+  let pid2 = browser2.frameLoader.remoteTab.osPid;
+
+  // Note, this might not be true once fission is implemented (Bug 1451850)
+  ok(pid1 != pid2, "We should have different processes here.");
+
+  await SpecialPowers.spawn(browser1, [], async function () {
+    is(content.document.cookie, "", "Expecting no cookies");
+  });
+
+  await SpecialPowers.spawn(browser2, [], async function () {
+    is(content.document.cookie, "", "Expecting no cookies");
+  });
+
+  await SpecialPowers.spawn(browser1, [], async function () {
+    content.document.cookie = "a1=test";
+  });
+
+  await SpecialPowers.spawn(browser2, [], async function () {
+    is(content.document.cookie, "a1=test", "Cookie should be set");
+    content.document.cookie = "a1=other_test";
+  });
+
+  await SpecialPowers.spawn(browser1, [], async function () {
+    is(content.document.cookie, "a1=other_test", "Cookie should be set");
+    content.document.cookie = "a2=again";
+  });
+
+  await SpecialPowers.spawn(browser2, [], async function () {
+    is(
+      content.document.cookie,
+      "a1=other_test; a2=again",
+      "Cookie should be set"
+    );
+    content.document.cookie = "a1=; expires=Thu, 01-Jan-1970 00:00:01 GMT;";
+    content.document.cookie = "a2=; expires=Thu, 01-Jan-1970 00:00:01 GMT;";
+  });
+
+  await SpecialPowers.spawn(browser1, [], async function () {
+    is(content.document.cookie, "", "Cookies should be cleared");
+  });
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+
+  ok(true, "Got to the end of the test!");
+});
diff --git a/netwerk/test/browser/browser_fetch_lnk.js b/netwerk/test/browser/browser_fetch_lnk.js
new file mode 100644
index 0000000000..ea8ef57984
--- /dev/null
+++ b/netwerk/test/browser/browser_fetch_lnk.js
@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async () => {
+  const FILE_PAGE = Services.io.newFileURI(
+    new FileUtils.File(getTestFilePath("dummy.html"))
+  ).spec;
+  await BrowserTestUtils.withNewTab(FILE_PAGE, async browser => {
+    try {
+      await SpecialPowers.spawn(browser, [], () =>
+        content.fetch("./file_lnk.lnk")
+      );
+      ok(
+        false,
+        "Loading lnk must fail if it links to a file from other directory"
+      );
+    } catch (err) {
+      is(err.constructor.name, "TypeError", "Should fail on Windows");
+    }
+  });
+});
diff --git a/netwerk/test/browser/browser_nsIFormPOSTActionChannel.js b/netwerk/test/browser/browser_nsIFormPOSTActionChannel.js
new file mode 100644
index 0000000000..e791794579
--- /dev/null
+++ b/netwerk/test/browser/browser_nsIFormPOSTActionChannel.js
@@ -0,0 +1,273 @@
+/*
+ * Tests for bug 1241377: A channel with nsIFormPOSTActionChannel interface
+ * should be able to accept form POST.
+ */
+
+"use strict";
+
+const SCHEME = "x-bug1241377";
+
+const FORM_BASE = SCHEME + "://dummy/form/";
+const NORMAL_FORM_URI = FORM_BASE + "normal.html";
+const UPLOAD_FORM_URI = FORM_BASE + "upload.html";
+const POST_FORM_URI = FORM_BASE + "post.html";
+
+const ACTION_BASE = SCHEME + "://dummy/action/";
+const NORMAL_ACTION_URI = ACTION_BASE + "normal.html";
+const UPLOAD_ACTION_URI = ACTION_BASE + "upload.html";
+const POST_ACTION_URI = ACTION_BASE + "post.html";
+
+function CustomProtocolHandler() {}
+CustomProtocolHandler.prototype = {
+  /** nsIProtocolHandler */
+  get scheme() {
+    return SCHEME;
+  },
+  newChannel(aURI, aLoadInfo) {
+    return new CustomChannel(aURI, aLoadInfo);
+  },
+  allowPort(port, scheme) {
+    return port != -1;
+  },
+
+  /** nsISupports */
+  QueryInterface: ChromeUtils.generateQI(["nsIProtocolHandler"]),
+};
+
+function CustomChannel(aURI, aLoadInfo) {
+  this.uri = aURI;
+  this.loadInfo = aLoadInfo;
+
+  this._uploadStream = null;
+
+  var interfaces = [Ci.nsIRequest, Ci.nsIChannel];
+  if (this.uri.spec == POST_ACTION_URI) {
+    interfaces.push(Ci.nsIFormPOSTActionChannel);
+  } else if (this.uri.spec == UPLOAD_ACTION_URI) {
+    interfaces.push(Ci.nsIUploadChannel);
+  }
+  this.QueryInterface = ChromeUtils.generateQI(interfaces);
+}
+CustomChannel.prototype = {
+  /** nsIUploadChannel */
+  get uploadStream() {
+    return this._uploadStream;
+  },
+  set uploadStream(val) {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  setUploadStream(aStream, aContentType, aContentLength) {
+    this._uploadStream = aStream;
+  },
+
+  /** nsIChannel */
+  get originalURI() {
+    return this.uri;
+  },
+  get URI() {
+    return this.uri;
+  },
+  owner: null,
+  notificationCallbacks: null,
+  get securityInfo() {
+    return null;
+  },
+  get contentType() {
+    return "text/html";
+  },
+  set contentType(val) {},
+  contentCharset: "UTF-8",
+  get contentLength() {
+    return -1;
+  },
+  set contentLength(val) {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  open() {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  asyncOpen(aListener) {
+    var data = `
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>test bug 1241377</title>
+</head>
+<body>
+`;
+
+    if (this.uri.spec.startsWith(FORM_BASE)) {
+      data += `
+<form id="form" action="${this.uri.spec.replace(FORM_BASE, ACTION_BASE)}"
+      method="post" enctype="text/plain" target="frame">
+<input type="hidden" name="foo" value="bar">
+<input type="submit">
+</form>
+
+<iframe id="frame" name="frame" width="200" height="200"></iframe>
+
+<script type="text/javascript">
+<!--
+document.getElementById('form').submit();
+//-->
+</script>
+`;
+    } else if (this.uri.spec.startsWith(ACTION_BASE)) {
+      var postData = "";
+      var headers = {};
+      if (this._uploadStream) {
+        var bstream = Cc["@mozilla.org/binaryinputstream;1"].createInstance(
+          Ci.nsIBinaryInputStream
+        );
+        bstream.setInputStream(this._uploadStream);
+        postData = bstream.readBytes(bstream.available());
+
+        if (this._uploadStream instanceof Ci.nsIMIMEInputStream) {
+          this._uploadStream.visitHeaders((name, value) => {
+            headers[name] = value;
+          });
+        }
+      }
+      data += `
+<input id="upload_stream" value="${this._uploadStream ? "yes" : "no"}">
+<input id="post_data" value="${btoa(postData)}">
+<input id="upload_headers" value='${JSON.stringify(headers)}'>
+`;
+    }
+
+    data += `
+</body>
+</html>
+`;
+
+    var stream = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
+      Ci.nsIStringInputStream
+    );
+    stream.setData(data, data.length);
+
+    var runnable = {
+      run: () => {
+        try {
+          aListener.onStartRequest(this, null);
+        } catch (e) {}
+        try {
+          aListener.onDataAvailable(this, stream, 0, stream.available());
+        } catch (e) {}
+        try {
+          aListener.onStopRequest(this, null, Cr.NS_OK);
+        } catch (e) {}
+      },
+    };
+    Services.tm.dispatchToMainThread(runnable);
+  },
+
+  /** nsIRequest */
+  get name() {
+    return this.uri.spec;
+  },
+  isPending() {
+    return false;
+  },
+  get status() {
+    return Cr.NS_OK;
+  },
+  cancel(status) {},
+  loadGroup: null,
+  loadFlags:
+    Ci.nsIRequest.LOAD_NORMAL |
+    Ci.nsIRequest.INHIBIT_CACHING |
+    Ci.nsIRequest.LOAD_BYPASS_CACHE,
+};
+
+function frameScript() {
+  /* eslint-env mozilla/frame-script */
+  /* eslint-disable mozilla/no-arbitrary-setTimeout */
+  addMessageListener("Test:WaitForIFrame", function () {
+    var check = function () {
+      if (content) {
+        var frame = content.document.getElementById("frame");
+        if (frame) {
+          var upload_stream =
+            frame.contentDocument.getElementById("upload_stream");
+          var post_data = frame.contentDocument.getElementById("post_data");
+          var headers = frame.contentDocument.getElementById("upload_headers");
+          if (upload_stream && post_data && headers) {
+            sendAsyncMessage("Test:IFrameLoaded", [
+              upload_stream.value,
+              post_data.value,
+              headers.value,
+            ]);
+            return;
+          }
+        }
+      }
+
+      setTimeout(check, 100);
+    };
+
+    check();
+  });
+  /* eslint-enable mozilla/no-arbitrary-setTimeout */
+}
+
+function loadTestTab(uri) {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, uri);
+  var browser = gBrowser.selectedBrowser;
+
+  let manager = browser.messageManager;
+  browser.messageManager.loadFrameScript(
+    "data:,(" + frameScript.toString() + ")();",
+    true
+  );
+
+  return new Promise(resolve => {
+    function listener({ data: [hasUploadStream, postData, headers] }) {
+      manager.removeMessageListener("Test:IFrameLoaded", listener);
+      resolve([hasUploadStream, atob(postData), JSON.parse(headers)]);
+    }
+
+    manager.addMessageListener("Test:IFrameLoaded", listener);
+    manager.sendAsyncMessage("Test:WaitForIFrame");
+  });
+}
+
+add_task(async function () {
+  var handler = new CustomProtocolHandler();
+  Services.io.registerProtocolHandler(
+    SCHEME,
+    handler,
+    Ci.nsIProtocolHandler.URI_NORELATIVE |
+      Ci.nsIProtocolHandler.URI_IS_LOCAL_RESOURCE,
+    -1
+  );
+  registerCleanupFunction(function () {
+    Services.io.unregisterProtocolHandler(SCHEME);
+  });
+});
+
+add_task(async function () {
+  var [hasUploadStream] = await loadTestTab(NORMAL_FORM_URI);
+  is(hasUploadStream, "no", "normal action should not have uploadStream");
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function () {
+  var [hasUploadStream] = await loadTestTab(UPLOAD_FORM_URI);
+  is(hasUploadStream, "no", "upload action should not have uploadStream");
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function () {
+  var [hasUploadStream, postData, headers] = await loadTestTab(POST_FORM_URI);
+
+  is(hasUploadStream, "yes", "post action should have uploadStream");
+  is(postData, "foo=bar\r\n", "POST data is received correctly");
+
+  is(headers["Content-Type"], "text/plain", "Content-Type header is correct");
+  is(headers["Content-Length"], undefined, "Content-Length header is correct");
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/netwerk/test/browser/browser_post_auth.js b/netwerk/test/browser/browser_post_auth.js
new file mode 100644
index 0000000000..93be694f3b
--- /dev/null
+++ b/netwerk/test/browser/browser_post_auth.js
@@ -0,0 +1,62 @@
+"use strict";
+
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+const FOLDER = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://mochi.test:8888/"
+);
+
+add_task(async function () {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    `${FOLDER}post.html`
+  );
+  BrowserTestUtils.loadURIString(tab.linkedBrowser, `${FOLDER}post.html`);
+  await browserLoadedPromise;
+
+  let finalLoadPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    `${FOLDER}auth_post.sjs`
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    let file = new content.File(
+      [new content.Blob(["1234".repeat(1024 * 500)], { type: "text/plain" })],
+      "test-name"
+    );
+    content.document.getElementById("input_file").mozSetFileArray([file]);
+    content.document.getElementById("form").submit();
+  });
+
+  let promptPromise = PromptTestUtils.handleNextPrompt(
+    tab.linkedBrowser,
+    {
+      modalType: Services.prefs.getIntPref("prompts.modalType.httpAuth"),
+      promptType: "promptUserAndPass",
+    },
+    { buttonNumClick: 0, loginInput: "user", passwordInput: "pass" }
+  );
+
+  await promptPromise;
+
+  await finalLoadPromise;
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    Assert.ok(content.location.href.includes("auth_post.sjs"));
+    Assert.ok(content.document.body.innerHTML.includes("1234"));
+  });
+
+  BrowserTestUtils.removeTab(tab);
+
+  // Clean up any active logins we added during the test.
+  Services.obs.notifyObservers(null, "net:clear-active-logins");
+});
diff --git a/netwerk/test/browser/browser_post_file.js b/netwerk/test/browser/browser_post_file.js
new file mode 100644
index 0000000000..7ccbd6435d
--- /dev/null
+++ b/netwerk/test/browser/browser_post_file.js
@@ -0,0 +1,71 @@
+/*
+ * Tests for bug 1241100: Post to local file should not overwrite the file.
+ */
+"use strict";
+
+async function createTestFile(filename, content) {
+  let path = PathUtils.join(PathUtils.tempDir, filename);
+  await IOUtils.writeUTF8(path, content);
+  return path;
+}
+
+add_task(async function () {
+  var postFilename = "post_file.html";
+  var actionFilename = "action_file.html";
+
+  var postFileContent = `
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>post file</title>
+</head>
+<body onload="document.getElementById('form').submit();">
+<form id="form" action="${actionFilename}" method="post" enctype="text/plain" target="frame">
+<input type="hidden" name="foo" value="bar">
+<input type="submit">
+</form>
+<iframe id="frame" name="frame"></iframe>
+</body>
+</html>
+`;
+
+  var actionFileContent = `
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>action file</title>
+</head>
+<body>
+<div id="action_file_ok">ok</div>
+</body>
+</html>
+`;
+
+  var postPath = await createTestFile(postFilename, postFileContent);
+  var actionPath = await createTestFile(actionFilename, actionFileContent);
+
+  var postURI = PathUtils.toFileURI(postPath);
+  var actionURI = PathUtils.toFileURI(actionPath);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:blank"
+  );
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    true,
+    actionURI
+  );
+  BrowserTestUtils.loadURIString(tab.linkedBrowser, postURI);
+  await browserLoadedPromise;
+
+  var actionFileContentAfter = await IOUtils.readUTF8(actionPath);
+  is(actionFileContentAfter, actionFileContent, "action file is not modified");
+
+  await IOUtils.remove(postPath);
+  await IOUtils.remove(actionPath);
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/netwerk/test/browser/browser_resource_navigation.js b/netwerk/test/browser/browser_resource_navigation.js
new file mode 100644
index 0000000000..56ec280b83
--- /dev/null
+++ b/netwerk/test/browser/browser_resource_navigation.js
@@ -0,0 +1,76 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+add_task(async function () {
+  info("Make sure navigation through links in resource:// pages work");
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "resource://gre/" },
+    async function (browser) {
+      // Following a directory link shall properly open the directory (bug 1224046)
+      await SpecialPowers.spawn(browser, [], function () {
+        let link = Array.prototype.filter.call(
+          content.document.getElementsByClassName("dir"),
+          function (element) {
+            let name = element.textContent;
+            // Depending whether resource:// is backed by jar: or file://,
+            // directories either have a trailing slash or they don't.
+            if (name.endsWith("/")) {
+              name = name.slice(0, -1);
+            }
+            return name == "components";
+          }
+        )[0];
+        // First ensure the link is in the viewport
+        link.scrollIntoView();
+        // Then click on it.
+        link.click();
+      });
+
+      await BrowserTestUtils.browserLoaded(
+        browser,
+        undefined,
+        "resource://gre/components/"
+      );
+
+      // Following the parent link shall properly open the parent (bug 1366180)
+      await SpecialPowers.spawn(browser, [], function () {
+        let link = content.document
+          .getElementById("UI_goUp")
+          .getElementsByTagName("a")[0];
+        // The link should always be high enough in the page to be in the viewport.
+        link.click();
+      });
+
+      await BrowserTestUtils.browserLoaded(
+        browser,
+        undefined,
+        "resource://gre/"
+      );
+
+      // Following a link to a given file shall properly open the file.
+      await SpecialPowers.spawn(browser, [], function () {
+        let link = Array.prototype.filter.call(
+          content.document.getElementsByClassName("file"),
+          function (element) {
+            return element.textContent == "greprefs.js";
+          }
+        )[0];
+        link.scrollIntoView();
+        link.click();
+      });
+
+      await BrowserTestUtils.browserLoaded(
+        browser,
+        undefined,
+        "resource://gre/greprefs.js"
+      );
+
+      ok(true, "Got to the end of the test!");
+    }
+  );
+});
diff --git a/netwerk/test/browser/browser_speculative_connection_link_header.js b/netwerk/test/browser/browser_speculative_connection_link_header.js
new file mode 100644
index 0000000000..24549d30b0
--- /dev/null
+++ b/netwerk/test/browser/browser_speculative_connection_link_header.js
@@ -0,0 +1,57 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Services.prefs.setBoolPref("network.http.debug-observations", true);
+
+registerCleanupFunction(function () {
+  Services.prefs.clearUserPref("network.http.debug-observations");
+});
+
+// Test steps:
+// 1. Load file_link_header.sjs
+// 2.`<link rel="preconnect" href="https://localhost">` is in
+//    file_link_header.sjs, so we will create a speculative connection.
+// 3. We use "speculative-connect-request" topic to observe whether the
+//    speculative connection is attempted.
+// 4. Finally, we check if the observed host and partition key are the same and
+//    as the expected.
+add_task(async function test_link_preconnect() {
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/file_link_header.sjs`;
+
+  let observed = "";
+  let observer = {
+    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+    observe(aSubject, aTopic, aData) {
+      if (aTopic == "speculative-connect-request") {
+        Services.obs.removeObserver(observer, "speculative-connect-request");
+        observed = aData;
+      }
+    },
+  };
+  Services.obs.addObserver(observer, "speculative-connect-request");
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  // The hash key should be like:
+  // ".S........[tlsflags0x00000000]localhost:443^partitionKey=%28https%2Cexample.com%29"
+
+  // Extracting "localhost:443"
+  let hostPortRegex = /\[.*\](.*?)\^/;
+  let hostPortMatch = hostPortRegex.exec(observed);
+  let hostPort = hostPortMatch ? hostPortMatch[1] : "";
+  // Extracting "%28https%2Cexample.com%29"
+  let partitionKeyRegex = /\^partitionKey=(.*)$/;
+  let partitionKeyMatch = partitionKeyRegex.exec(observed);
+  let partitionKey = partitionKeyMatch ? partitionKeyMatch[1] : "";
+
+  Assert.equal(hostPort, "localhost:443");
+  Assert.equal(partitionKey, "%28https%2Cexample.com%29");
+});
diff --git a/netwerk/test/browser/browser_test_favicon.js b/netwerk/test/browser/browser_test_favicon.js
new file mode 100644
index 0000000000..99cc6b0922
--- /dev/null
+++ b/netwerk/test/browser/browser_test_favicon.js
@@ -0,0 +1,26 @@
+// Tests third party cookie blocking using a favicon loaded from a different
+// domain. The cookie should be considered third party.
+"use strict";
+add_task(async function () {
+  const iconUrl =
+    "http://example.org/browser/netwerk/test/browser/damonbowling.jpg";
+  const pageUrl =
+    "http://example.com/browser/netwerk/test/browser/file_favicon.html";
+  await SpecialPowers.pushPrefEnv({
+    set: [["network.cookie.cookieBehavior", 1]],
+  });
+
+  let promise = TestUtils.topicObserved("cookie-rejected", subject => {
+    let uri = subject.QueryInterface(Ci.nsIURI);
+    return uri.spec == iconUrl;
+  });
+
+  // Kick off a page load that will load the favicon.
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
+  registerCleanupFunction(async function () {
+    BrowserTestUtils.removeTab(tab);
+  });
+
+  await promise;
+  ok(true, "foreign favicon cookie was blocked");
+});
diff --git a/netwerk/test/browser/browser_test_io_activity.js b/netwerk/test/browser/browser_test_io_activity.js
new file mode 100644
index 0000000000..1e9cb29b6d
--- /dev/null
+++ b/netwerk/test/browser/browser_test_io_activity.js
@@ -0,0 +1,50 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+const ROOT_URL = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "https://example.com/"
+);
+const TEST_URL = "about:license";
+const TEST_URL2 = ROOT_URL + "ioactivity.html";
+
+var gotSocket = false;
+var gotFile = false;
+var gotSqlite = false;
+var gotEmptyData = false;
+
+function processResults(results) {
+  for (let data of results) {
+    console.log(data.location);
+    gotEmptyData = data.rx == 0 && data.tx == 0 && !gotEmptyData;
+    gotSocket = data.location.startsWith("socket://127.0.0.1:") || gotSocket;
+    gotFile = data.location.endsWith("aboutLicense.css") || gotFile;
+    gotSqlite = data.location.endsWith("places.sqlite") || gotSqlite;
+    // check for the write-ahead file as well
+    gotSqlite = data.location.endsWith("places.sqlite-wal") || gotSqlite;
+  }
+}
+
+add_task(async function testRequestIOActivity() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["io.activity.enabled", true]],
+  });
+  waitForExplicitFinish();
+  Services.obs.notifyObservers(null, "profile-initial-state");
+
+  await BrowserTestUtils.withNewTab(TEST_URL, async function (browser) {
+    await BrowserTestUtils.withNewTab(TEST_URL2, async function (browser) {
+      let results = await ChromeUtils.requestIOActivity();
+      processResults(results);
+
+      ok(gotSocket, "A socket was used");
+      // test deactivated for now
+      // ok(gotFile, "A file was used");
+      ok(gotSqlite, "A sqlite DB was used");
+      ok(!gotEmptyData, "Every I/O event had data");
+    });
+  });
+});
diff --git a/netwerk/test/browser/cookie_filtering_helper.sys.mjs b/netwerk/test/browser/cookie_filtering_helper.sys.mjs
new file mode 100644
index 0000000000..f3db10ffb3
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_helper.sys.mjs
@@ -0,0 +1,166 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The functions in this file will run in the content process in a test
+// scope.
+/* eslint-env mozilla/simpletest */
+/* global ContentTaskUtils, content */
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+const { NetUtil } = ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
+const info = console.log;
+
+export var HTTPS_EXAMPLE_ORG = "https://example.org";
+export var HTTPS_EXAMPLE_COM = "https://example.com";
+export var HTTP_EXAMPLE_COM = "http://example.com";
+
+export function browserTestPath(uri) {
+  return uri + "/browser/netwerk/test/browser/";
+}
+
+export function waitForAllExpectedTests() {
+  return ContentTaskUtils.waitForCondition(() => {
+    return content.testDone === true;
+  });
+}
+
+export function cleanupObservers() {
+  Services.obs.notifyObservers(null, "cookie-content-filter-cleanup");
+}
+
+export async function preclean_test() {
+  // enable all cookies for the set-cookie trigger via setCookieStringFromHttp
+  Services.prefs.setIntPref("network.cookie.cookieBehavior", 0);
+  Services.prefs.setBoolPref(
+    "network.cookieJarSettings.unblocked_for_testing",
+    true
+  );
+
+  Services.prefs.setBoolPref("network.cookie.sameSite.laxByDefault", false);
+  Services.prefs.setBoolPref(
+    "network.cookie.sameSite.noneRequiresSecure",
+    false
+  );
+  Services.prefs.setBoolPref("network.cookie.sameSite.schemeful", false);
+
+  Services.cookies.removeAll();
+}
+
+export async function cleanup_test() {
+  Services.prefs.clearUserPref("network.cookie.cookieBehavior");
+  Services.prefs.clearUserPref(
+    "network.cookieJarSettings.unblocked_for_testing"
+  );
+
+  Services.prefs.clearUserPref("network.cookie.sameSite.laxByDefault");
+  Services.prefs.clearUserPref("network.cookie.sameSite.noneRequiresSecure");
+  Services.prefs.clearUserPref("network.cookie.sameSite.schemeful");
+
+  Services.cookies.removeAll();
+}
+
+export async function fetchHelper(url, cookie, secure, domain = "") {
+  let headers = new Headers();
+
+  headers.append("return-set-cookie", cookie);
+
+  if (!secure) {
+    headers.append("return-insecure-cookie", cookie);
+  }
+
+  if (domain != "") {
+    headers.append("return-cookie-domain", domain);
+  }
+
+  info("fetching " + url);
+  await fetch(url, { headers });
+}
+
+// cookie header strings with multiple name=value pairs delimited by \n
+// will trigger multiple "cookie-changed" signals
+export function triggerSetCookieFromHttp(uri, cookie, fpd = "", ucd = 0) {
+  info("about to trigger set-cookie: " + uri + " " + cookie);
+  let channel = NetUtil.newChannel({
+    uri,
+    loadUsingSystemPrincipal: true,
+    contentPolicyType: Ci.nsIContentPolicy.TYPE_DOCUMENT,
+  });
+
+  if (fpd != "") {
+    channel.loadInfo.originAttributes = { firstPartyDomain: fpd };
+  }
+
+  if (ucd != 0) {
+    channel.loadInfo.originAttributes = { userContextId: ucd };
+  }
+  Services.cookies.setCookieStringFromHttp(uri, cookie, channel);
+}
+
+export async function triggerSetCookieFromHttpPrivate(uri, cookie) {
+  info("about to trigger set-cookie: " + uri + " " + cookie);
+  let channel = NetUtil.newChannel({
+    uri,
+    loadUsingSystemPrincipal: true,
+    contentPolicyType: Ci.nsIContentPolicy.TYPE_DOCUMENT,
+  }).QueryInterface(Ci.nsIPrivateBrowsingChannel);
+  channel.loadInfo.originAttributes = { privateBrowsingId: 1 };
+  channel.setPrivate(true);
+  Services.cookies.setCookieStringFromHttp(uri, cookie, channel);
+}
+
+// observer/listener function that will be run on the content processes
+// listens and checks for the expected cookies
+export function checkExpectedCookies(expected, browserName) {
+  const COOKIE_FILTER_TEST_MESSAGE = "cookie-content-filter-test";
+  const COOKIE_FILTER_TEST_CLEANUP = "cookie-content-filter-cleanup";
+
+  // Counting the expected number of tests is vital to the integrity of these
+  // tests due to the fact that this test suite relies on triggering tests
+  // to occur on multiple content processes.
+  // As such, test modifications/bugs often lead to silent failures.
+  // Hence, we count to ensure we didn't break anything
+  // To reduce risk here, we modularize each test as much as possible to
+  // increase liklihood that a silent failure will trigger a no-test
+  // error/warning
+  content.testDone = false;
+  let testNumber = 0;
+
+  // setup observer that continues listening/testing
+  function obs(subject, topic) {
+    // cleanup trigger recieved -> tear down the observer
+    if (topic == COOKIE_FILTER_TEST_CLEANUP) {
+      info("cleaning up: " + browserName);
+      Services.obs.removeObserver(obs, COOKIE_FILTER_TEST_MESSAGE);
+      Services.obs.removeObserver(obs, COOKIE_FILTER_TEST_CLEANUP);
+      return;
+    }
+
+    // test trigger recv'd -> perform test on cookie contents
+    if (topic == COOKIE_FILTER_TEST_MESSAGE) {
+      info("Checking if cookie visible: " + browserName);
+      let result = content.document.cookie;
+      let resultStr =
+        "Result " +
+        result +
+        " == expected: " +
+        expected[testNumber] +
+        " in " +
+        browserName;
+      ok(result == expected[testNumber], resultStr);
+      testNumber++;
+      if (testNumber >= expected.length) {
+        info("finishing browser tests: " + browserName);
+        content.testDone = true;
+      }
+      return;
+    }
+
+    ok(false, "Didn't handle cookie message properly"); //
+  }
+
+  info("setting up observers: " + browserName);
+  Services.obs.addObserver(obs, COOKIE_FILTER_TEST_MESSAGE);
+  Services.obs.addObserver(obs, COOKIE_FILTER_TEST_CLEANUP);
+}
diff --git a/netwerk/test/browser/cookie_filtering_resource.sjs b/netwerk/test/browser/cookie_filtering_resource.sjs
new file mode 100644
index 0000000000..979d56dc9c
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_resource.sjs
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+function handleRequest(request, response) {
+  response.setStatusLine(request.httpVersion, 200, "OK");
+  response.setHeader("Cache-Control", "no-cache", false);
+  response.setHeader("Content-Type", "text/html", false);
+
+  // configure set-cookie domain
+  let domain = "";
+  if (request.hasHeader("return-cookie-domain")) {
+    domain = "; Domain=" + request.getHeader("return-cookie-domain");
+  }
+
+  // configure set-cookie sameSite
+  let authStr = "; Secure";
+  if (request.hasHeader("return-insecure-cookie")) {
+    authStr = "";
+  }
+
+  // use headers to decide if we have them
+  if (request.hasHeader("return-set-cookie")) {
+    response.setHeader(
+      "Set-Cookie",
+      request.getHeader("return-set-cookie") + authStr + domain,
+      false
+    );
+  }
+
+  let body = "<!DOCTYPE html> <html> <body> true </body> </html>";
+  response.write(body);
+}
diff --git a/netwerk/test/browser/cookie_filtering_secure_resource_com.html b/netwerk/test/browser/cookie_filtering_secure_resource_com.html
new file mode 100644
index 0000000000..e25a719644
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_secure_resource_com.html
@@ -0,0 +1,6 @@
+ <!DOCTYPE html>
+<html>
+<body>
+<img src="https://example.com/browser/netwerk/test/browser/cookie_filtering_square.png" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/cookie_filtering_secure_resource_com.html^headers^ b/netwerk/test/browser/cookie_filtering_secure_resource_com.html^headers^
new file mode 100644
index 0000000000..2bdf118064
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_secure_resource_com.html^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-store
+Set-Cookie: test-cookie=comhtml
diff --git a/netwerk/test/browser/cookie_filtering_secure_resource_org.html b/netwerk/test/browser/cookie_filtering_secure_resource_org.html
new file mode 100644
index 0000000000..7221dc370d
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_secure_resource_org.html
@@ -0,0 +1,6 @@
+ <!DOCTYPE html>
+<html>
+<body>
+<img src="https://example.org/browser/netwerk/test/browser/cookie_filtering_square.png" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/cookie_filtering_secure_resource_org.html^headers^ b/netwerk/test/browser/cookie_filtering_secure_resource_org.html^headers^
new file mode 100644
index 0000000000..924c150ccc
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_secure_resource_org.html^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-store
+Set-Cookie: test-cookie=orghtml
diff --git a/netwerk/test/browser/cookie_filtering_square.png b/netwerk/test/browser/cookie_filtering_square.png
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_square.png
diff --git a/netwerk/test/browser/cookie_filtering_square.png^headers^ b/netwerk/test/browser/cookie_filtering_square.png^headers^
new file mode 100644
index 0000000000..912856ae4a
--- /dev/null
+++ b/netwerk/test/browser/cookie_filtering_square.png^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-cache
+Set-Cookie: test-cookie=png
diff --git a/netwerk/test/browser/damonbowling.jpg b/netwerk/test/browser/damonbowling.jpg
new file mode 100644
index 0000000000..8bdb2b6042
--- /dev/null
+++ b/netwerk/test/browser/damonbowling.jpg
diff --git a/netwerk/test/browser/damonbowling.jpg^headers^ b/netwerk/test/browser/damonbowling.jpg^headers^
new file mode 100644
index 0000000000..77f4f49089
--- /dev/null
+++ b/netwerk/test/browser/damonbowling.jpg^headers^
@@ -0,0 +1,2 @@
+Cache-Control: no-store
+Set-Cookie: damon=bowling
diff --git a/netwerk/test/browser/dummy.html b/netwerk/test/browser/dummy.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/dummy.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/early_hint_asset.sjs b/netwerk/test/browser/early_hint_asset.sjs
new file mode 100644
index 0000000000..84a3dba37e
--- /dev/null
+++ b/netwerk/test/browser/early_hint_asset.sjs
@@ -0,0 +1,51 @@
+"use strict";
+
+function handleRequest(request, response) {
+  let hinted =
+    request.hasHeader("X-Moz") && request.getHeader("X-Moz") === "early hint";
+  let count = JSON.parse(getSharedState("earlyHintCount"));
+  if (hinted) {
+    count.hinted += 1;
+  } else {
+    count.normal += 1;
+  }
+  setSharedState("earlyHintCount", JSON.stringify(count));
+
+  let content = "";
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let asset = qs.get("as");
+
+  if (qs.get("cached") === "1") {
+    response.setHeader("Cache-Control", "max-age=604800", false);
+  } else {
+    response.setHeader("Cache-Control", "no-cache", false);
+  }
+
+  if (asset === "image") {
+    response.setHeader("Content-Type", "image/png", false);
+    // set to green/black horizontal stripes (71 bytes)
+    content = atob(
+      hinted
+        ? "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAADklEQVQIW2OU+i/FAAcADoABNV8XGBMAAAAASUVORK5CYII="
+        : "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAE0lEQVQIW2P4//+/N8MkBiAGsgA1bAe1SzDY8gAAAABJRU5ErkJggg=="
+    );
+  } else if (asset === "style") {
+    response.setHeader("Content-Type", "text/css", false);
+    // green background on hint response, purple response otherwise
+    content = `#square { background: ${hinted ? "#1aff1a" : "#4b0092"}`;
+  } else if (asset === "script") {
+    response.setHeader("Content-Type", "application/javascript", false);
+    // green background on hint response, purple response otherwise
+    content = `window.onload = function() {
+      document.getElementById('square').style.background = "${
+        hinted ? "#1aff1a" : "#4b0092"
+      }";
+    }`;
+  } else if (asset === "fetch") {
+    response.setHeader("Content-Type", "text/plain", false);
+    content = hinted ? "hinted" : "normal";
+  }
+
+  response.write(content);
+}
diff --git a/netwerk/test/browser/early_hint_asset_html.sjs b/netwerk/test/browser/early_hint_asset_html.sjs
new file mode 100644
index 0000000000..2ac07ca8ed
--- /dev/null
+++ b/netwerk/test/browser/early_hint_asset_html.sjs
@@ -0,0 +1,136 @@
+"use strict";
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let asset = qs.get("as");
+  let hinted = qs.get("hinted") === "1";
+  let httpCode = qs.get("code");
+  let uuid = qs.get("uuid");
+  let cached = qs.get("cached") === "1";
+
+  let url = `early_hint_asset.sjs?as=${asset}${uuid ? `&uuid=${uuid}` : ""}${
+    cached ? "&cached=1" : ""
+  }`;
+
+  // write to raw socket
+  response.seizePower();
+  let link = "";
+  if (hinted) {
+    response.write("HTTP/1.1 103 Early Hint\r\n");
+    if (asset === "fetch" || asset === "font") {
+      // fetch and font has to specify the crossorigin attribute
+      // https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#attr-as
+      link = `Link: <${url}>; rel=preload; as=${asset}; crossorigin=anonymous\r\n`;
+      response.write(link);
+    } else if (asset === "module") {
+      // module preloads are handled differently
+      link = `Link: <${url}>; rel=modulepreload\r\n`;
+      response.write(link);
+    } else {
+      link = `Link: <${url}>; rel=preload; as=${asset}\r\n`;
+      response.write(link);
+    }
+    response.write("\r\n");
+  }
+
+  let body = "";
+  if (asset === "image") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body>
+      <img src="${url}" width="100px">
+      </body>
+      </html>`;
+  } else if (asset === "style") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <link rel="stylesheet" type="text/css" href="${url}">
+      </head>
+      <body>
+      <h1>Test preload css<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "script") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <script src="${url}"></script>
+      </head>
+      <body>
+      <h1>Test preload javascript<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "module") {
+    // this code assumes that the .sjs for the module is in the same directory
+    var file_name = url.split("/");
+    file_name = file_name[file_name.length - 1];
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      </head>
+      <body>
+      <h1>Test preload module<h1>
+      <div id="square" style="width:100px;height:100px;">
+      <script type="module">
+        import { draw } from "./${file_name}";
+        draw();
+      </script>
+      </body>
+      </html>
+    `;
+  } else if (asset === "fetch") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body onload="onLoad()">
+      <script>
+      function onLoad() {
+        fetch("${url}")
+          .then(r => r.text())
+          .then(r => document.getElementsByTagName("h2")[0].textContent = r);
+      }
+      </script>
+      <h1>Test preload fetch</h1>
+      <h2>Fetching...</h2>
+      </body>
+      </html>
+    `;
+  } else if (asset === "font") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <style>
+      @font-face {
+        font-family: "preloadFont";
+        src: url("${url}");
+      }
+      body {
+        font-family: "preloadFont";
+      }
+      </style>
+      </head>
+      <body>
+      <h1>Test preload font<h1>
+      </body>
+      </html>
+    `;
+  }
+
+  if (!httpCode) {
+    response.write(`HTTP/1.1 200 OK\r\n`);
+  } else {
+    response.write(`HTTP/1.1 ${httpCode} Error\r\n`);
+  }
+  response.write(link);
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  response.write("\r\n");
+  response.write(body);
+  response.finish();
+}
diff --git a/netwerk/test/browser/early_hint_csp_options_html.sjs b/netwerk/test/browser/early_hint_csp_options_html.sjs
new file mode 100644
index 0000000000..17c286f8ac
--- /dev/null
+++ b/netwerk/test/browser/early_hint_csp_options_html.sjs
@@ -0,0 +1,121 @@
+"use strict";
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let asset = qs.get("as");
+  let hinted = qs.get("hinted") !== "0";
+  let httpCode = qs.get("code");
+  let csp = qs.get("csp");
+  let csp_in_early_hint = qs.get("csp_in_early_hint");
+  let host = qs.get("host");
+
+  // eslint-disable-next-line mozilla/use-services
+  let uuidGenerator = Cc["@mozilla.org/uuid-generator;1"].getService(
+    Ci.nsIUUIDGenerator
+  );
+  let uuid = uuidGenerator.generateUUID().toString();
+  let url = `early_hint_pixel.sjs?as=${asset}&uuid=${uuid}`;
+  if (host) {
+    url = host + url;
+  }
+
+  // write to raw socket
+  response.seizePower();
+
+  if (hinted) {
+    response.write("HTTP/1.1 103 Early Hint\r\n");
+    if (csp_in_early_hint) {
+      response.write(
+        `Content-Security-Policy: ${csp_in_early_hint.replaceAll('"', "")}\r\n`
+      );
+    }
+    response.write(`Link: <${url}>; rel=preload; as=${asset}\r\n`);
+    response.write("\r\n");
+  }
+
+  let body = "";
+  if (asset === "image") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body>
+      <img id="test_image" src="${url}" width="100px">
+      </body>
+      </html>`;
+  } else if (asset === "style") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <link rel="stylesheet" type="text/css" href="${url}">
+      </head>
+      <body>
+      <h1>Test preload css<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "script") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <script src="${url}"></script>
+      </head>
+      <body>
+      <h1>Test preload javascript<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "fetch") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body onload="onLoad()">
+      <script>
+      function onLoad() {
+        fetch("${url}")
+          .then(r => r.text())
+          .then(r => document.getElementsByTagName("h2")[0].textContent = r);
+      }
+      </script>
+      <h1>Test preload fetch</h1>
+      <h2>Fetching...</h2>
+      </body>
+      </html>
+    `;
+  } else if (asset === "font") {
+    body = `<!DOCTYPE html>
+    <html>
+    <head>
+    <style>
+    @font-face {
+      font-family: "preloadFont";
+      src: url("${url}") format("woff");
+    }
+    body {
+      font-family: "preloadFont";
+    }
+    </style>
+    </head>
+    <body>
+    <h1>Test preload font<h1>
+    </body>
+    </html>
+  `;
+  }
+
+  if (!httpCode) {
+    response.write(`HTTP/1.1 200 OK\r\n`);
+  } else {
+    response.write(`HTTP/1.1 ${httpCode} Error\r\n`);
+  }
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  if (csp) {
+    response.write(`Content-Security-Policy: ${csp.replaceAll('"', "")}\r\n`);
+  }
+  response.write("\r\n");
+  response.write(body);
+
+  response.finish();
+}
diff --git a/netwerk/test/browser/early_hint_error.sjs b/netwerk/test/browser/early_hint_error.sjs
new file mode 100644
index 0000000000..4f5e751073
--- /dev/null
+++ b/netwerk/test/browser/early_hint_error.sjs
@@ -0,0 +1,37 @@
+"use strict";
+
+Cu.importGlobalProperties(["URLSearchParams"]);
+
+function handleRequest(request, response) {
+  response.setStatusLine(
+    request.httpVersion,
+    parseInt(request.queryString),
+    "Dynamic error"
+  );
+  response.setHeader("Content-Type", "image/png", false);
+  response.setHeader("Cache-Control", "max-age=604800", false);
+
+  // count requests
+  let image;
+  let count = JSON.parse(getSharedState("earlyHintCount"));
+  if (
+    request.hasHeader("X-Moz") &&
+    request.getHeader("X-Moz") === "early hint"
+  ) {
+    count.hinted += 1;
+    // set to green/black horizontal stripes (71 bytes)
+    image = atob(
+      "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAADklEQVQIW2OU+i/FAAcADoABNV8X" +
+        "GBMAAAAASUVORK5CYII="
+    );
+  } else {
+    count.normal += 1;
+    // set to purple/white checkered pattern (76 bytes)
+    image = atob(
+      "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAE0lEQVQIW2P4//+/N8MkBiAGsgA1" +
+        "bAe1SzDY8gAAAABJRU5ErkJggg=="
+    );
+  }
+  setSharedState("earlyHintCount", JSON.stringify(count));
+  response.write(image);
+}
diff --git a/netwerk/test/browser/early_hint_main_html.sjs b/netwerk/test/browser/early_hint_main_html.sjs
new file mode 100644
index 0000000000..8867aa8754
--- /dev/null
+++ b/netwerk/test/browser/early_hint_main_html.sjs
@@ -0,0 +1,64 @@
+"use strict";
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+
+  // write to raw socket
+  response.seizePower();
+
+  let qs = new URLSearchParams(request.queryString);
+  let imgs = [];
+  let new_hint = true;
+  let new_header = true;
+  for (const [imgUrl, uuid] of qs.entries()) {
+    if (new_hint) {
+      // we need to write a new header
+      new_hint = false;
+      response.write("HTTP/1.1 103 Early Hint\r\n");
+    }
+    if (!imgUrl.length) {
+      // next hint in new early hint response when empty string is passed
+      new_header = true;
+      if (uuid === "new_response") {
+        new_hint = true;
+        response.write("\r\n");
+      } else if (uuid === "non_link_header") {
+        response.write("Content-Length: 25\r\n");
+      }
+      response.write("\r\n");
+    } else {
+      // either append link in new header or in same header
+      if (new_header) {
+        new_header = false;
+        response.write("Link: ");
+      } else {
+        response.write(", ");
+      }
+      // add query string to make request unique this has the drawback that
+      // the preloaded image can't accept query strings on it's own / or has
+      // to strip the appended "?uuid" from the query string before parsing
+      imgs.push(`<img src="${imgUrl}?${uuid}" width="100px">`);
+      response.write(`<${imgUrl}?${uuid}>; rel=preload; as=image`);
+    }
+  }
+  if (!new_hint) {
+    // add separator to main document
+    response.write("\r\n\r\n");
+  }
+
+  let body = `<!DOCTYPE html>
+<html>
+<body>
+${imgs.join("\n")}
+</body>
+</html>`;
+
+  // main document response
+  response.write("HTTP/1.1 200 OK\r\n");
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  response.write("\r\n");
+  response.write(body);
+  response.finish();
+}
diff --git a/netwerk/test/browser/early_hint_main_redirect.sjs b/netwerk/test/browser/early_hint_main_redirect.sjs
new file mode 100644
index 0000000000..607b676dc8
--- /dev/null
+++ b/netwerk/test/browser/early_hint_main_redirect.sjs
@@ -0,0 +1,68 @@
+"use strict";
+
+// In an SJS file we need to get the setTimeout bits ourselves, despite
+// what eslint might think applies for browser tests.
+// eslint-disable-next-line mozilla/no-redeclare-with-import-autofix
+let { setTimeout } = ChromeUtils.importESModule(
+  "resource://gre/modules/Timer.sys.mjs"
+);
+
+async function handleRequest(request, response) {
+  let hinted =
+    request.hasHeader("X-Moz") && request.getHeader("X-Moz") === "early hint";
+  let count = JSON.parse(getSharedState("earlyHintCount"));
+  if (hinted) {
+    count.hinted += 1;
+  } else {
+    count.normal += 1;
+  }
+  setSharedState("earlyHintCount", JSON.stringify(count));
+  response.setHeader("Cache-Control", "max-age=604800", false);
+
+  let content = "";
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let asset = qs.get("as");
+
+  if (asset === "image") {
+    response.setHeader("Content-Type", "image/png", false);
+    // set to green/black horizontal stripes (71 bytes)
+    content = atob(
+      hinted
+        ? "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAADklEQVQIW2OU+i/FAAcADoABNV8XGBMAAAAASUVORK5CYII="
+        : "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAE0lEQVQIW2P4//+/N8MkBiAGsgA1bAe1SzDY8gAAAABJRU5ErkJggg=="
+    );
+  } else if (asset === "style") {
+    response.setHeader("Content-Type", "text/css", false);
+    // green background on hint response, purple response otherwise
+    content = `#square { background: ${hinted ? "#1aff1a" : "#4b0092"}`;
+  } else if (asset === "script") {
+    response.setHeader("Content-Type", "application/javascript", false);
+    // green background on hint response, purple response otherwise
+    content = `window.onload = function() {
+      document.getElementById('square').style.background = "${
+        hinted ? "#1aff1a" : "#4b0092"
+      }";
+    }`;
+  } else if (asset === "module") {
+    response.setHeader("Content-Type", "application/javascript", false);
+    // green background on hint response, purple response otherwise
+    content = `export function draw() {
+      document.getElementById('square').style.background = "${
+        hinted ? "#1aff1a" : "#4b0092"
+      }";
+    }`;
+  } else if (asset === "fetch") {
+    response.setHeader("Content-Type", "text/plain", false);
+    content = hinted ? "hinted" : "normal";
+  } else if (asset === "font") {
+    response.setHeader("Content-Type", "font/svg+xml", false);
+    content = '<font><font-face font-family="preloadFont" /></font>';
+  }
+  response.processAsync();
+  setTimeout(() => {
+    response.write(content);
+    response.finish();
+  }, 0);
+  //response.write(content);
+}
diff --git a/netwerk/test/browser/early_hint_pixel.sjs b/netwerk/test/browser/early_hint_pixel.sjs
new file mode 100644
index 0000000000..56a64e9af2
--- /dev/null
+++ b/netwerk/test/browser/early_hint_pixel.sjs
@@ -0,0 +1,37 @@
+"use strict";
+
+function handleRequest(request, response) {
+  response.setHeader("Content-Type", "image/png", false);
+  response.setHeader("Cache-Control", "max-age=604800", false);
+
+  // the typo in "Referer" is part of the http spec
+  if (request.hasHeader("Referer")) {
+    setSharedState("requestReferrer", request.getHeader("Referer"));
+  } else {
+    setSharedState("requestReferrer", "");
+  }
+
+  let count = JSON.parse(getSharedState("earlyHintCount"));
+  let image;
+  // send different sized images depending whether this is an early hint request
+  if (
+    request.hasHeader("X-Moz") &&
+    request.getHeader("X-Moz") === "early hint"
+  ) {
+    count.hinted += 1;
+    // set to green/black horizontal stripes (71 bytes)
+    image = atob(
+      "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAADklEQVQIW2OU+i/FAAcADoABNV8X" +
+        "GBMAAAAASUVORK5CYII="
+    );
+  } else {
+    count.normal += 1;
+    // set to purple/white checkered pattern (76 bytes)
+    image = atob(
+      "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAE0lEQVQIW2P4//+/N8MkBiAGsgA1" +
+        "bAe1SzDY8gAAAABJRU5ErkJggg=="
+    );
+  }
+  setSharedState("earlyHintCount", JSON.stringify(count));
+  response.write(image);
+}
diff --git a/netwerk/test/browser/early_hint_pixel_count.sjs b/netwerk/test/browser/early_hint_pixel_count.sjs
new file mode 100644
index 0000000000..b59dd035de
--- /dev/null
+++ b/netwerk/test/browser/early_hint_pixel_count.sjs
@@ -0,0 +1,9 @@
+"use strict";
+
+function handleRequest(request, response) {
+  if (request.hasHeader("X-Early-Hint-Count-Start")) {
+    setSharedState("earlyHintCount", JSON.stringify({ hinted: 0, normal: 0 }));
+  }
+  response.setHeader("Content-Type", "application/json", false);
+  response.write(getSharedState("earlyHintCount"));
+}
diff --git a/netwerk/test/browser/early_hint_preconnect_html.sjs b/netwerk/test/browser/early_hint_preconnect_html.sjs
new file mode 100644
index 0000000000..02f832d28c
--- /dev/null
+++ b/netwerk/test/browser/early_hint_preconnect_html.sjs
@@ -0,0 +1,33 @@
+"use strict";
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let href = qs.get("href");
+  let crossOrigin = qs.get("crossOrigin");
+
+  // write to raw socket
+  response.seizePower();
+
+  response.write("HTTP/1.1 103 Early Hint\r\n");
+  response.write(
+    `Link: <${href}>; rel=preconnect; crossOrigin=${crossOrigin}\r\n`
+  );
+  response.write("\r\n");
+
+  let body = `<!DOCTYPE html>
+      <html>
+      <body>
+      <h1>Test rel=preconnect<h1>
+      </body>
+      </html>`;
+
+  response.write("HTTP/1.1 200 OK\r\n");
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  response.write("\r\n");
+  response.write(body);
+
+  response.finish();
+}
diff --git a/netwerk/test/browser/early_hint_preload_test_helper.sys.mjs b/netwerk/test/browser/early_hint_preload_test_helper.sys.mjs
new file mode 100644
index 0000000000..17c0f95f76
--- /dev/null
+++ b/netwerk/test/browser/early_hint_preload_test_helper.sys.mjs
@@ -0,0 +1,131 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { Assert } from "resource://testing-common/Assert.sys.mjs";
+import { BrowserTestUtils } from "resource://testing-common/BrowserTestUtils.sys.mjs";
+
+const { gBrowser } = Services.wm.getMostRecentWindow("navigator:browser");
+
+export async function request_count_checking(testName, got, expected) {
+  // stringify to pretty print assert output
+  let g = JSON.stringify(got);
+  let e = JSON.stringify(expected);
+  // each early hint request can starts one hinted request, but doesn't yet
+  // complete the early hint request during the test case
+  Assert.ok(
+    got.hinted == expected.hinted,
+    `${testName}: unexpected amount of hinted request made expected ${expected.hinted} (${e}), got ${got.hinted} (${g})`
+  );
+  // when the early hint request doesn't complete fast enough, another request
+  // is currently sent from the main document
+  let expected_normal = expected.normal;
+  Assert.ok(
+    got.normal == expected_normal,
+    `${testName}: unexpected amount of normal request made expected ${expected_normal} (${e}), got ${got.normal} (${g})`
+  );
+}
+
+export async function test_hint_preload(
+  testName,
+  requestFrom,
+  imgUrl,
+  expectedRequestCount,
+  uuid = undefined
+) {
+  // generate a uuid if none were passed
+  if (uuid == undefined) {
+    uuid = Services.uuid.generateUUID();
+  }
+  await test_hint_preload_internal(
+    testName,
+    requestFrom,
+    [[imgUrl, uuid.toString()]],
+    expectedRequestCount
+  );
+}
+
+// - testName is just there to be printed during Asserts when failing
+// - the baseUrl can't have query strings, because they are currently used to pass
+//   the early hint the server responds with
+// - urls are in the form [[url1, uuid1], ...]. The uuids are there to make each preload
+//   unique and not available in the cache from other test cases
+// - expectedRequestCount is the sum of all requested objects { normal: count, hinted: count }
+export async function test_hint_preload_internal(
+  testName,
+  requestFrom,
+  imgUrls,
+  expectedRequestCount
+) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "http://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let requestUrl =
+    requestFrom +
+    "/browser/netwerk/test/browser/early_hint_main_html.sjs?" +
+    new URLSearchParams(imgUrls).toString(); // encode the hinted images as query string
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: requestUrl,
+      waitForLoad: true,
+    },
+    async function () {}
+  );
+
+  let gotRequestCount = await fetch(
+    "http://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  await request_count_checking(testName, gotRequestCount, expectedRequestCount);
+}
+
+// Verify that CSP policies in both the 103 response as well as the main response are respected.
+// e.g.
+// 103 Early Hint
+// Content-Security-Policy: style-src: self;
+// Link: </style.css>; rel=preload; as=style
+// 200 OK
+// Content-Security-Policy: style-src: none;
+// Link: </font.ttf>; rel=preload; as=font
+
+// Server-side we verify that:
+//  - the hinted preload request was made as expected
+//  - the load request request was made as expected
+// Client-side, we verify that the image was loaded or not loaded, depending on the scenario
+
+// This verifies preload hints and requests
+export async function test_preload_hint_and_request(input, expected_results) {
+  // reset the count
+  let headers = new Headers();
+  headers.append("X-Early-Hint-Count-Start", "");
+  await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs",
+    { headers }
+  );
+
+  let requestUrl = `https://example.com/browser/netwerk/test/browser/early_hint_csp_options_html.sjs?as=${
+    input.resource_type
+  }&hinted=${input.hinted ? "1" : "0"}${input.csp ? "&csp=" + input.csp : ""}${
+    input.csp_in_early_hint
+      ? "&csp_in_early_hint=" + input.csp_in_early_hint
+      : ""
+  }${input.host ? "&host=" + input.host : ""}`;
+
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, requestUrl, true);
+
+  let gotRequestCount = await fetch(
+    "https://example.com/browser/netwerk/test/browser/early_hint_pixel_count.sjs"
+  ).then(response => response.json());
+
+  await Assert.deepEqual(gotRequestCount, expected_results, input.test_name);
+
+  gBrowser.removeCurrentTab();
+  Services.cache2.clear();
+}
diff --git a/netwerk/test/browser/early_hint_redirect.sjs b/netwerk/test/browser/early_hint_redirect.sjs
new file mode 100644
index 0000000000..6bcb6bdc86
--- /dev/null
+++ b/netwerk/test/browser/early_hint_redirect.sjs
@@ -0,0 +1,21 @@
+"use strict";
+
+function handleRequest(request, response) {
+  // increase count
+  let count = JSON.parse(getSharedState("earlyHintCount"));
+  if (
+    request.hasHeader("X-Moz") &&
+    request.getHeader("X-Moz") === "early hint"
+  ) {
+    count.hinted += 1;
+  } else {
+    count.normal += 1;
+  }
+  setSharedState("earlyHintCount", JSON.stringify(count));
+
+  // respond with redirect
+  response.setStatusLine(request.httpVersion, 301, "Moved Permanently");
+  let location = request.queryString;
+  response.setHeader("Location", location, false);
+  response.write("Hello world!");
+}
diff --git a/netwerk/test/browser/early_hint_redirect_html.sjs b/netwerk/test/browser/early_hint_redirect_html.sjs
new file mode 100644
index 0000000000..2cda0b90f7
--- /dev/null
+++ b/netwerk/test/browser/early_hint_redirect_html.sjs
@@ -0,0 +1,25 @@
+"use strict";
+
+// usage via url parameters:
+//  - link: if set sends a link header with the given link value as an early hint repsonse
+//  - location: sets destination of 301 response
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let link = qs.get("link");
+  let location = qs.get("location");
+
+  // write to raw socket
+  response.seizePower();
+  if (link != undefined) {
+    response.write("HTTP/1.1 103 Early Hint\r\n");
+    response.write(`Link: ${link}\r\n`);
+    response.write("\r\n");
+  }
+
+  response.write("HTTP/1.1 307 Temporary Redirect\r\n");
+  response.write(`Location: ${location}\r\n`);
+  response.write("\r\n");
+  response.finish();
+}
diff --git a/netwerk/test/browser/early_hint_referrer_policy_html.sjs b/netwerk/test/browser/early_hint_referrer_policy_html.sjs
new file mode 100644
index 0000000000..0fb0c0cbc5
--- /dev/null
+++ b/netwerk/test/browser/early_hint_referrer_policy_html.sjs
@@ -0,0 +1,133 @@
+"use strict";
+
+function handleRequest(request, response) {
+  Cu.importGlobalProperties(["URLSearchParams"]);
+  let qs = new URLSearchParams(request.queryString);
+  let asset = qs.get("as");
+  var action = qs.get("action");
+  let hinted = qs.get("hinted") !== "0";
+  let httpCode = qs.get("code");
+  let header_referrer_policy = qs.get("header_referrer_policy");
+  let link_referrer_policy = qs.get("link_referrer_policy");
+
+  // eslint-disable-next-line mozilla/use-services
+  let uuidGenerator = Cc["@mozilla.org/uuid-generator;1"].getService(
+    Ci.nsIUUIDGenerator
+  );
+  let uuid = uuidGenerator.generateUUID().toString();
+  let url = `early_hint_pixel.sjs?as=${asset}&uuid=${uuid}`;
+
+  if (action === "get_request_referrer_results") {
+    response.setHeader("Cache-Control", "no-cache", false);
+    response.setHeader("Content-Type", "text/plain", false);
+    response.write(getSharedState("requestReferrer"));
+    return;
+  } else if (action === "reset_referrer_results") {
+    response.setHeader("Cache-Control", "no-cache", false);
+    response.setHeader("Content-Type", "text/plain", false);
+    response.write(setSharedState("requestReferrer", "not set"));
+    return;
+  }
+
+  // write to raw socket
+  response.seizePower();
+
+  if (hinted) {
+    response.write("HTTP/1.1 103 Early Hint\r\n");
+
+    if (header_referrer_policy) {
+      response.write(
+        `Referrer-Policy: ${header_referrer_policy.replaceAll('"', "")}\r\n`
+      );
+    }
+
+    response.write(
+      `Link: <${url}>; rel=preload; as=${asset}; ${
+        link_referrer_policy ? "referrerpolicy=" + link_referrer_policy : ""
+      } \r\n`
+    );
+    response.write("\r\n");
+  }
+
+  let body = "";
+  if (asset === "image") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body>
+      <img src="${url}" width="100px">
+      </body>
+      </html>`;
+  } else if (asset === "style") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <link rel="stylesheet" type="text/css" href="${url}">
+      </head>
+      <body>
+      <h1>Test preload css<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "script") {
+    body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <script src="${url}"></script>
+      </head>
+      <body>
+      <h1>Test preload javascript<h1>
+      <div id="square" style="width:100px;height:100px;">
+      </body>
+      </html>
+    `;
+  } else if (asset === "fetch") {
+    body = `<!DOCTYPE html>
+      <html>
+      <body onload="onLoad()">
+      <script>
+      function onLoad() {
+        fetch("${url}")
+          .then(r => r.text())
+          .then(r => document.getElementsByTagName("h2")[0].textContent = r);
+      }
+      </script>
+      <h1>Test preload fetch</h1>
+      <h2>Fetching...</h2>
+      </body>
+      </html>
+    `;
+  } else if (asset === "font") {
+    body = `<!DOCTYPE html>
+    <html>
+    <head>
+    <style>
+    @font-face {
+      font-family: "preloadFont";
+      src: url("${url}") format("woff");
+    }
+    body {
+      font-family: "preloadFont";
+    }
+    </style>
+    </head>
+    <body>
+    <h1>Test preload font<h1>
+    </body>
+    </html>
+  `;
+  }
+
+  if (!httpCode) {
+    response.write(`HTTP/1.1 200 OK\r\n`);
+  } else {
+    response.write(`HTTP/1.1 ${httpCode} Error\r\n`);
+  }
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  response.write("\r\n");
+  response.write(body);
+
+  response.finish();
+}
diff --git a/netwerk/test/browser/file_favicon.html b/netwerk/test/browser/file_favicon.html
new file mode 100644
index 0000000000..77532a3a53
--- /dev/null
+++ b/netwerk/test/browser/file_favicon.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+
+<html>
+  <head>
+    <link rel="shortcut icon" href="http://example.org/browser/netwerk/test/browser/damonbowling.jpg">
+  </head>
+</html>
diff --git a/netwerk/test/browser/file_link_header.sjs b/netwerk/test/browser/file_link_header.sjs
new file mode 100644
index 0000000000..6bab515d19
--- /dev/null
+++ b/netwerk/test/browser/file_link_header.sjs
@@ -0,0 +1,24 @@
+"use strict";
+
+function handleRequest(request, response) {
+  // write to raw socket
+  response.seizePower();
+  let body = `<!DOCTYPE html>
+      <html>
+      <head>
+      <link rel="preconnect" href="https://localhost">
+      </head>
+      <body>
+      <h1>Test rel=preconnect<h1>
+      </body>
+      </html>`;
+
+  response.write("HTTP/1.1 200 OK\r\n");
+  response.write("Content-Type: text/html;charset=utf-8\r\n");
+  response.write("Cache-Control: no-cache\r\n");
+  response.write(`Content-Length: ${body.length}\r\n`);
+  response.write("\r\n");
+  response.write(body);
+
+  response.finish();
+}
diff --git a/netwerk/test/browser/file_lnk.lnk b/netwerk/test/browser/file_lnk.lnk
new file mode 100644
index 0000000000..abce7587d2
--- /dev/null
+++ b/netwerk/test/browser/file_lnk.lnk
diff --git a/netwerk/test/browser/ioactivity.html b/netwerk/test/browser/ioactivity.html
new file mode 100644
index 0000000000..5e23f6f117
--- /dev/null
+++ b/netwerk/test/browser/ioactivity.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>IOActivity Test Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/no_103_preload.html b/netwerk/test/browser/no_103_preload.html
new file mode 100644
index 0000000000..64f5e79259
--- /dev/null
+++ b/netwerk/test/browser/no_103_preload.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+<body>
+<img src="http://example.com/browser/netwerk/test/browser/early_hint_pixel.sjs" width="100px">
+</body>
+</html>
diff --git a/netwerk/test/browser/no_103_preload.html^headers^ b/netwerk/test/browser/no_103_preload.html^headers^
new file mode 100644
index 0000000000..9e23c73b7f
--- /dev/null
+++ b/netwerk/test/browser/no_103_preload.html^headers^
@@ -0,0 +1 @@
+Cache-Control: no-cache
diff --git a/netwerk/test/browser/post.html b/netwerk/test/browser/post.html
new file mode 100644
index 0000000000..9d238c2b97
--- /dev/null
+++ b/netwerk/test/browser/post.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>post file</title>
+</head>
+<body">
+<form id="form" action="auth_post.sjs" method="post" enctype="multipart/form-data">
+<input type="hidden" id="input_hidden" name="foo" value="bar">
+<input id="input_file" name="test_file" type="file">
+<input type="submit">
+</form>
+</body>
+</html>
diff --git a/netwerk/test/browser/redirect.sjs b/netwerk/test/browser/redirect.sjs
new file mode 100644
index 0000000000..09e7d9b1e4
--- /dev/null
+++ b/netwerk/test/browser/redirect.sjs
@@ -0,0 +1,6 @@
+function handleRequest(request, response) {
+  response.setStatusLine(request.httpVersion, 301, "Moved Permanently");
+  let location = request.queryString;
+  response.setHeader("Location", location, false);
+  response.write("Hello world!");
+}
diff --git a/netwerk/test/browser/res.css b/netwerk/test/browser/res.css
new file mode 100644
index 0000000000..eab83656ed
--- /dev/null
+++ b/netwerk/test/browser/res.css
@@ -0,0 +1,4 @@
+/* François was here. */
+#purple-text {
+  color: purple;
+}
diff --git a/netwerk/test/browser/res.css^headers^ b/netwerk/test/browser/res.css^headers^
new file mode 100644
index 0000000000..e13897f157
--- /dev/null
+++ b/netwerk/test/browser/res.css^headers^
@@ -0,0 +1 @@
+Content-Type: text/css; charset=utf-8
diff --git a/netwerk/test/browser/res.csv b/netwerk/test/browser/res.csv
new file mode 100644
index 0000000000..b0246d5964
--- /dev/null
+++ b/netwerk/test/browser/res.csv
@@ -0,0 +1 @@
+1,2,3
diff --git a/netwerk/test/browser/res.csv^headers^ b/netwerk/test/browser/res.csv^headers^
new file mode 100644
index 0000000000..8d30131059
--- /dev/null
+++ b/netwerk/test/browser/res.csv^headers^
@@ -0,0 +1 @@
+Content-Type: text/csv;
diff --git a/netwerk/test/browser/res.mp3 b/netwerk/test/browser/res.mp3
new file mode 100644
index 0000000000..bad506cf18
--- /dev/null
+++ b/netwerk/test/browser/res.mp3
diff --git a/netwerk/test/browser/res.unknown b/netwerk/test/browser/res.unknown
new file mode 100644
index 0000000000..3546645658
--- /dev/null
+++ b/netwerk/test/browser/res.unknown
@@ -0,0 +1 @@
+unknown
diff --git a/netwerk/test/browser/res_206.html b/netwerk/test/browser/res_206.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_206.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_206.html^headers^ b/netwerk/test/browser/res_206.html^headers^
new file mode 100644
index 0000000000..5a3e3a24c8
--- /dev/null
+++ b/netwerk/test/browser/res_206.html^headers^
@@ -0,0 +1,2 @@
+HTTP 206
+Content-Type: text/html;
diff --git a/netwerk/test/browser/res_206.mp3 b/netwerk/test/browser/res_206.mp3
new file mode 100644
index 0000000000..bad506cf18
--- /dev/null
+++ b/netwerk/test/browser/res_206.mp3
diff --git a/netwerk/test/browser/res_206.mp3^headers^ b/netwerk/test/browser/res_206.mp3^headers^
new file mode 100644
index 0000000000..6e7e4d23ba
--- /dev/null
+++ b/netwerk/test/browser/res_206.mp3^headers^
@@ -0,0 +1 @@
+HTTP 206
diff --git a/netwerk/test/browser/res_img.png b/netwerk/test/browser/res_img.png
new file mode 100644
index 0000000000..94e7eb6db2
--- /dev/null
+++ b/netwerk/test/browser/res_img.png
diff --git a/netwerk/test/browser/res_img_for_unknown_decoder b/netwerk/test/browser/res_img_for_unknown_decoder
new file mode 100644
index 0000000000..74d74fde5a
--- /dev/null
+++ b/netwerk/test/browser/res_img_for_unknown_decoder
diff --git a/netwerk/test/browser/res_img_for_unknown_decoder^headers^ b/netwerk/test/browser/res_img_for_unknown_decoder^headers^
new file mode 100644
index 0000000000..defde38020
--- /dev/null
+++ b/netwerk/test/browser/res_img_for_unknown_decoder^headers^
@@ -0,0 +1,2 @@
+Content-Type:
+Content-Encoding: gzip
diff --git a/netwerk/test/browser/res_img_unknown.png b/netwerk/test/browser/res_img_unknown.png
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_img_unknown.png
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_invalid_partial.mp3 b/netwerk/test/browser/res_invalid_partial.mp3
new file mode 100644
index 0000000000..bad506cf18
--- /dev/null
+++ b/netwerk/test/browser/res_invalid_partial.mp3
diff --git a/netwerk/test/browser/res_invalid_partial.mp3^headers^ b/netwerk/test/browser/res_invalid_partial.mp3^headers^
new file mode 100644
index 0000000000..0213f38e4e
--- /dev/null
+++ b/netwerk/test/browser/res_invalid_partial.mp3^headers^
@@ -0,0 +1,2 @@
+HTTP 206
+Content-Range: bytes 100-1024/*
diff --git a/netwerk/test/browser/res_nosniff.html b/netwerk/test/browser/res_nosniff.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_nosniff.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_nosniff.html^headers^ b/netwerk/test/browser/res_nosniff.html^headers^
new file mode 100644
index 0000000000..024cdcf5ab
--- /dev/null
+++ b/netwerk/test/browser/res_nosniff.html^headers^
@@ -0,0 +1,2 @@
+X-Content-Type-Options: nosniff
+Content-Type: text/html;
diff --git a/netwerk/test/browser/res_nosniff2.html b/netwerk/test/browser/res_nosniff2.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_nosniff2.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_nosniff2.html^headers^ b/netwerk/test/browser/res_nosniff2.html^headers^
new file mode 100644
index 0000000000..e46db01e23
--- /dev/null
+++ b/netwerk/test/browser/res_nosniff2.html^headers^
@@ -0,0 +1,2 @@
+X-Content-Type-Options: nosniff
+Content-Type: text/test
diff --git a/netwerk/test/browser/res_not_200or206.mp3 b/netwerk/test/browser/res_not_200or206.mp3
new file mode 100644
index 0000000000..bad506cf18
--- /dev/null
+++ b/netwerk/test/browser/res_not_200or206.mp3
diff --git a/netwerk/test/browser/res_not_200or206.mp3^headers^ b/netwerk/test/browser/res_not_200or206.mp3^headers^
new file mode 100644
index 0000000000..dd0b48aaa0
--- /dev/null
+++ b/netwerk/test/browser/res_not_200or206.mp3^headers^
@@ -0,0 +1 @@
+HTTP 226
diff --git a/netwerk/test/browser/res_not_ok.html b/netwerk/test/browser/res_not_ok.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_not_ok.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_not_ok.html^headers^ b/netwerk/test/browser/res_not_ok.html^headers^
new file mode 100644
index 0000000000..5d15d79e46
--- /dev/null
+++ b/netwerk/test/browser/res_not_ok.html^headers^
@@ -0,0 +1 @@
+HTTP 302 Found
diff --git a/netwerk/test/browser/res_object.html b/netwerk/test/browser/res_object.html
new file mode 100644
index 0000000000..8097415d17
--- /dev/null
+++ b/netwerk/test/browser/res_object.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+  <script>
+     let foo = async () => {
+       let url = "https://example.com/browser/netwerk/test/browser/res_img.png";
+       await fetch(url, { mode: "no-cors" });
+     }
+     foo();
+  </script>
+</body>
+</html>
diff --git a/netwerk/test/browser/res_sub_document.html b/netwerk/test/browser/res_sub_document.html
new file mode 100644
index 0000000000..8025fcdb20
--- /dev/null
+++ b/netwerk/test/browser/res_sub_document.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+
+<head>
+<meta http-equiv="content-type" content="text/html; charset=utf-8">
+</head>
+
+<html>
+<body>
+  <p>Dummy Page</p>
+</body>
+</html>
diff --git a/netwerk/test/browser/square.png b/netwerk/test/browser/square.png
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/netwerk/test/browser/square.png
diff --git a/netwerk/test/browser/test_1629307.html b/netwerk/test/browser/test_1629307.html
new file mode 100644
index 0000000000..01f2a0439e
--- /dev/null
+++ b/netwerk/test/browser/test_1629307.html
@@ -0,0 +1,9 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+  <iframe
+    src="https://example.org/browser/netwerk/test/browser/x_frame_options.html"></iframe>
+</body>
+</html>
diff --git a/netwerk/test/browser/x_frame_options.html b/netwerk/test/browser/x_frame_options.html
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/netwerk/test/browser/x_frame_options.html
diff --git a/netwerk/test/browser/x_frame_options.html^headers^ b/netwerk/test/browser/x_frame_options.html^headers^
new file mode 100644
index 0000000000..dc4bb949f5
--- /dev/null
+++ b/netwerk/test/browser/x_frame_options.html^headers^
@@ -0,0 +1,3 @@
+HTTP 401 UNAUTHORIZED
+X-Frame-Options: SAMEORIGIN
+WWW-Authenticate: basic realm="login required"
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 19:33:14 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 19:33:14 +0000
commit	36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree	105e8c98ddea1c1e4784a60a5a6410fa416be2de /netwerk/test/browser
parent	Initial commit. (diff)
download	firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip