Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

34 files changed, 3144 insertions, 0 deletions

diff --git a/caps/tests/gtest/TestBackgroundThreadPrincipal.cpp b/caps/tests/gtest/TestBackgroundThreadPrincipal.cpp
new file mode 100644
index 0000000000..82c7b15757
--- /dev/null
+++ b/caps/tests/gtest/TestBackgroundThreadPrincipal.cpp
@@ -0,0 +1,94 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/ContentPrincipal.h"
+#include "mozilla/NullPrincipal.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "nsIEventTarget.h"
+#include "nsISerialEventTarget.h"
+#include "nsIURIMutator.h"
+#include "nsNetUtil.h"
+#include "nsPrintfCString.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+template <typename F>
+void RunOnBackgroundThread(F&& aFunction) {
+  nsCOMPtr<nsISerialEventTarget> backgroundQueue;
+  ASSERT_NS_SUCCEEDED(NS_CreateBackgroundTaskQueue(
+      "RunOnBackgroundThread", getter_AddRefs(backgroundQueue)));
+  ASSERT_NS_SUCCEEDED(NS_DispatchAndSpinEventLoopUntilComplete(
+      "RunOnBackgroundThread"_ns, backgroundQueue,
+      NS_NewRunnableFunction("RunOnBackgroundThread",
+                             std::forward<F>(aFunction))));
+}
+
+TEST(BackgroundThreadPrincipal, CreateContent)
+{
+  RunOnBackgroundThread([] {
+    nsCOMPtr<nsIURI> contentURI;
+    ASSERT_NS_SUCCEEDED(NS_NewURI(getter_AddRefs(contentURI),
+                                  "http://subdomain.example.com:8000"_ns));
+    RefPtr<BasePrincipal> contentPrincipal =
+        BasePrincipal::CreateContentPrincipal(contentURI, OriginAttributes());
+    EXPECT_TRUE(contentPrincipal->Is<ContentPrincipal>());
+
+    nsCString origin;
+    ASSERT_NS_SUCCEEDED(contentPrincipal->GetOrigin(origin));
+    EXPECT_EQ(origin, "http://subdomain.example.com:8000"_ns);
+
+    nsCString siteOrigin;
+    ASSERT_NS_SUCCEEDED(contentPrincipal->GetSiteOrigin(siteOrigin));
+    EXPECT_EQ(siteOrigin, "http://example.com"_ns);
+  });
+}
+
+TEST(BackgroundThreadPrincipal, CreateNull)
+{
+  RunOnBackgroundThread([] {
+    nsCOMPtr<nsIURI> contentURI;
+    ASSERT_NS_SUCCEEDED(NS_NewURI(getter_AddRefs(contentURI),
+                                  "data:text/plain,hello world"_ns));
+    RefPtr<BasePrincipal> principal =
+        BasePrincipal::CreateContentPrincipal(contentURI, OriginAttributes());
+    EXPECT_TRUE(principal->Is<NullPrincipal>());
+
+    nsCString origin;
+    ASSERT_NS_SUCCEEDED(principal->GetOrigin(origin));
+    EXPECT_TRUE(StringBeginsWith(origin, "moz-nullprincipal:"_ns));
+  });
+}
+
+TEST(BackgroundThreadPrincipal, PrincipalInfoConversions)
+{
+  RunOnBackgroundThread([] {
+    nsCOMPtr<nsIURI> contentURI;
+    ASSERT_NS_SUCCEEDED(NS_NewURI(getter_AddRefs(contentURI),
+                                  "http://subdomain.example.com:8000"_ns));
+    RefPtr<BasePrincipal> contentPrincipal =
+        BasePrincipal::CreateContentPrincipal(contentURI, OriginAttributes());
+    EXPECT_TRUE(contentPrincipal->Is<ContentPrincipal>());
+
+    ipc::PrincipalInfo info;
+    ASSERT_NS_SUCCEEDED(ipc::PrincipalToPrincipalInfo(contentPrincipal, &info));
+
+    EXPECT_TRUE(info.type() == ipc::PrincipalInfo::TContentPrincipalInfo);
+    EXPECT_EQ(info.get_ContentPrincipalInfo().spec(),
+              "http://subdomain.example.com:8000/"_ns);
+    EXPECT_EQ(info.get_ContentPrincipalInfo().baseDomain(), "example.com"_ns);
+
+    auto result = PrincipalInfoToPrincipal(info);
+    ASSERT_TRUE(result.isOk());
+    nsCOMPtr<nsIPrincipal> deserialized = result.unwrap();
+    EXPECT_TRUE(deserialized->GetIsContentPrincipal());
+
+    EXPECT_TRUE(deserialized->Equals(contentPrincipal));
+  });
+}
+
+}  // namespace mozilla
diff --git a/caps/tests/gtest/TestNullPrincipalPrecursor.cpp b/caps/tests/gtest/TestNullPrincipalPrecursor.cpp
new file mode 100644
index 0000000000..96db5aeffd
--- /dev/null
+++ b/caps/tests/gtest/TestNullPrincipalPrecursor.cpp
@@ -0,0 +1,56 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/NullPrincipal.h"
+#include "nsIURIMutator.h"
+#include "nsPrintfCString.h"
+
+namespace mozilla {
+
+TEST(NullPrincipalPrecursor, EscapingRoundTrips)
+{
+  nsTArray<nsCString> inputs;
+
+  inputs.AppendElements(mozilla::Span(std::array{
+      "mailbox:///dev/shm/tmp5wkt9ff_.mozrunner/Mail/Local%20Folders/secure-mail?number=5"_ns,
+  }));
+
+  // Add a string for every ASCII byte both escaped and unescaped.
+  for (uint8_t c = 0; c < 128; ++c) {
+    inputs.AppendElement(nsPrintfCString("%02X: %c", c, (char)c));
+    inputs.AppendElement(nsPrintfCString("%02X: %%%02X", c, c));
+  }
+
+  nsID dummyID{0xddf15eaf,
+               0x3837,
+               0x4678,
+               {0x80, 0x3b, 0x86, 0x86, 0xe8, 0x17, 0x66, 0x71}};
+  nsCOMPtr<nsIURI> baseURI = NullPrincipal::CreateURI(nullptr, &dummyID);
+  ASSERT_TRUE(baseURI);
+
+  for (auto& input : inputs) {
+    // First build an escaped version of the input string using
+    // `EscapePrecursorQuery`.
+    nsCString escaped(input);
+    NullPrincipal::EscapePrecursorQuery(escaped);
+
+    // Make sure that this escaped URI round-trips through a `moz-nullprincipal`
+    // URI's query without any additional escapes.
+    nsCOMPtr<nsIURI> clone;
+    EXPECT_NS_SUCCEEDED(
+        NS_MutateURI(baseURI).SetQuery(escaped).Finalize(clone));
+    nsCString query;
+    EXPECT_NS_SUCCEEDED(clone->GetQuery(query));
+    EXPECT_EQ(escaped, query);
+
+    // Try to unescape our escaped URI and make sure we recover the input
+    // string.
+    nsCString unescaped(escaped);
+    NullPrincipal::UnescapePrecursorQuery(unescaped);
+    EXPECT_EQ(input, unescaped);
+  }
+}
+
+}  // namespace mozilla
diff --git a/caps/tests/gtest/TestOriginAttributes.cpp b/caps/tests/gtest/TestOriginAttributes.cpp
new file mode 100644
index 0000000000..fa759f80d5
--- /dev/null
+++ b/caps/tests/gtest/TestOriginAttributes.cpp
@@ -0,0 +1,118 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/NullPrincipal.h"
+#include "mozilla/Preferences.h"
+#include "nsNetUtil.h"
+
+using mozilla::OriginAttributes;
+using mozilla::Preferences;
+
+#define FPI_PREF "privacy.firstparty.isolate"
+#define SITE_PREF "privacy.firstparty.isolate.use_site"
+
+#define TEST_FPD(_spec, _expected) \
+  TestFPD(nsLiteralString(_spec), nsLiteralString(_expected))
+
+namespace mozilla {
+
+static void TestSuffix(const OriginAttributes& attrs) {
+  nsAutoCString suffix;
+  attrs.CreateSuffix(suffix);
+
+  OriginAttributes attrsFromSuffix;
+  bool success = attrsFromSuffix.PopulateFromSuffix(suffix);
+  EXPECT_TRUE(success);
+
+  EXPECT_EQ(attrs, attrsFromSuffix);
+}
+
+static void TestFPD(const nsAString& spec, const nsAString& expected) {
+  OriginAttributes attrs;
+  nsCOMPtr<nsIURI> url;
+  ASSERT_EQ(NS_NewURI(getter_AddRefs(url), spec), NS_OK);
+  attrs.SetFirstPartyDomain(true, url);
+  EXPECT_TRUE(attrs.mFirstPartyDomain.Equals(expected));
+
+  TestSuffix(attrs);
+}
+
+TEST(OriginAttributes, Suffix_default)
+{
+  OriginAttributes attrs;
+  TestSuffix(attrs);
+}
+
+TEST(OriginAttributes, Suffix_inIsolatedMozBrowser)
+{
+  OriginAttributes attrs(true);
+  TestSuffix(attrs);
+}
+
+TEST(OriginAttributes, FirstPartyDomain_default)
+{
+  bool oldFpiPref = Preferences::GetBool(FPI_PREF);
+  Preferences::SetBool(FPI_PREF, true);
+  bool oldSitePref = Preferences::GetBool(SITE_PREF);
+  Preferences::SetBool(SITE_PREF, false);
+
+  TEST_FPD(u"http://www.example.com", u"example.com");
+  TEST_FPD(u"http://www.example.com:80", u"example.com");
+  TEST_FPD(u"http://www.example.com:8080", u"example.com");
+  TEST_FPD(u"http://s3.amazonaws.com", u"s3.amazonaws.com");
+  TEST_FPD(u"http://com", u"com");
+  TEST_FPD(u"http://com.", u"com.");
+  TEST_FPD(u"http://com:8080", u"com");
+  TEST_FPD(u"http://.com", u"");
+  TEST_FPD(u"http://..com", u"");
+  TEST_FPD(u"http://127.0.0.1", u"127.0.0.1");
+  TEST_FPD(u"http://[::1]", u"[::1]");
+  TEST_FPD(u"about:config",
+           u"about.ef2a7dd5-93bc-417f-a698-142c3116864f.mozilla");
+  TEST_FPD(u"moz-extension://f5b6ca10-5bd4-4ed6-9baf-820dc5152bc1", u"");
+  TEST_FPD(u"moz-nullprincipal:{9bebdabb-828a-4284-8b00-432a968c6e42}",
+           u"9bebdabb-828a-4284-8b00-432a968c6e42.mozilla");
+  TEST_FPD(
+      u"moz-nullprincipal:{9bebdabb-828a-4284-8b00-432a968c6e42}"
+      u"?https://www.example.com",
+      u"9bebdabb-828a-4284-8b00-432a968c6e42.mozilla");
+
+  Preferences::SetBool(FPI_PREF, oldFpiPref);
+  Preferences::SetBool(SITE_PREF, oldSitePref);
+}
+
+TEST(OriginAttributes, FirstPartyDomain_site)
+{
+  bool oldFpiPref = Preferences::GetBool(FPI_PREF);
+  Preferences::SetBool(FPI_PREF, true);
+  bool oldSitePref = Preferences::GetBool(SITE_PREF);
+  Preferences::SetBool(SITE_PREF, true);
+
+  TEST_FPD(u"http://www.example.com", u"(http,example.com)");
+  TEST_FPD(u"http://www.example.com:80", u"(http,example.com)");
+  TEST_FPD(u"http://www.example.com:8080", u"(http,example.com)");
+  TEST_FPD(u"http://s3.amazonaws.com", u"(http,s3.amazonaws.com)");
+  TEST_FPD(u"http://com", u"(http,com)");
+  TEST_FPD(u"http://com.", u"(http,com.)");
+  TEST_FPD(u"http://com:8080", u"(http,com,8080)");
+  TEST_FPD(u"http://.com", u"(http,.com)");
+  TEST_FPD(u"http://..com", u"(http,..com)");
+  TEST_FPD(u"http://127.0.0.1", u"(http,127.0.0.1)");
+  TEST_FPD(u"http://[::1]", u"(http,[::1])");
+  TEST_FPD(u"about:config",
+           u"(about,about.ef2a7dd5-93bc-417f-a698-142c3116864f.mozilla)");
+  TEST_FPD(u"moz-extension://f5b6ca10-5bd4-4ed6-9baf-820dc5152bc1", u"");
+  TEST_FPD(u"moz-nullprincipal:{9bebdabb-828a-4284-8b00-432a968c6e42}",
+           u"9bebdabb-828a-4284-8b00-432a968c6e42.mozilla");
+  TEST_FPD(
+      u"moz-nullprincipal:{9bebdabb-828a-4284-8b00-432a968c6e42}"
+      u"?https://www.example.com",
+      u"9bebdabb-828a-4284-8b00-432a968c6e42.mozilla");
+
+  Preferences::SetBool(FPI_PREF, oldFpiPref);
+  Preferences::SetBool(SITE_PREF, oldSitePref);
+}
+
+}  // namespace mozilla
diff --git a/caps/tests/gtest/TestPrincipalAttributes.cpp b/caps/tests/gtest/TestPrincipalAttributes.cpp
new file mode 100644
index 0000000000..bc0bff90f6
--- /dev/null
+++ b/caps/tests/gtest/TestPrincipalAttributes.cpp
@@ -0,0 +1,39 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/BasePrincipal.h"
+#include "nsScriptSecurityManager.h"
+
+using namespace mozilla;
+
+class PrincipalAttributesParam {
+ public:
+  nsAutoCString spec;
+  bool expectIsIpAddress;
+};
+
+class PrincipalAttributesTest
+    : public ::testing::TestWithParam<PrincipalAttributesParam> {};
+
+TEST_P(PrincipalAttributesTest, PrincipalAttributesTest) {
+  nsCOMPtr<nsIScriptSecurityManager> ssm =
+      nsScriptSecurityManager::GetScriptSecurityManager();
+
+  nsAutoCString spec(GetParam().spec);
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv =
+      ssm->CreateContentPrincipalFromOrigin(spec, getter_AddRefs(principal));
+  ASSERT_EQ(rv, NS_OK);
+
+  ASSERT_EQ(principal->GetIsIpAddress(), GetParam().expectIsIpAddress);
+}
+
+static const PrincipalAttributesParam kAttributes[] = {
+    {nsAutoCString("https://mozilla.com"), false},
+    {nsAutoCString("https://127.0.0.1"), true},
+    {nsAutoCString("https://[::1]"), true},
+};
+
+INSTANTIATE_TEST_SUITE_P(TestPrincipalAttributes, PrincipalAttributesTest,
+                         ::testing::ValuesIn(kAttributes));
diff --git a/caps/tests/gtest/TestPrincipalSerialization.cpp b/caps/tests/gtest/TestPrincipalSerialization.cpp
new file mode 100644
index 0000000000..2e7d5afd0d
--- /dev/null
+++ b/caps/tests/gtest/TestPrincipalSerialization.cpp
@@ -0,0 +1,192 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/Base64.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/ContentPrincipal.h"
+#include "mozilla/NullPrincipal.h"
+#include "mozilla/SystemPrincipal.h"
+#include "mozilla/ExpandedPrincipal.h"
+
+using mozilla::BasePrincipal;
+using mozilla::ContentPrincipal;
+using mozilla::NullPrincipal;
+using mozilla::SystemPrincipal;
+
+// None of these tests work in debug due to assert guards
+#ifndef MOZ_DEBUG
+
+// calling toJSON() twice with the same string arg
+// (ensure that we truncate correctly where needed)
+TEST(PrincipalSerialization, ReusedJSONArgument)
+{
+  nsCOMPtr<nsIScriptSecurityManager> ssm =
+      nsScriptSecurityManager::GetScriptSecurityManager();
+
+  nsAutoCString spec("https://mozilla.com");
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv =
+      ssm->CreateContentPrincipalFromOrigin(spec, getter_AddRefs(principal));
+  ASSERT_EQ(rv, NS_OK);
+
+  nsAutoCString JSON;
+  rv = BasePrincipal::Cast(principal)->ToJSON(JSON);
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_TRUE(JSON.EqualsLiteral("{\"1\":{\"0\":\"https://mozilla.com/\"}}"));
+
+  nsAutoCString spec2("https://example.com");
+  nsCOMPtr<nsIPrincipal> principal2;
+  rv = ssm->CreateContentPrincipalFromOrigin(spec2, getter_AddRefs(principal2));
+  ASSERT_EQ(rv, NS_OK);
+
+  // Reuse JSON without truncation to check the code is doing this
+  rv = BasePrincipal::Cast(principal2)->ToJSON(JSON);
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_TRUE(JSON.EqualsLiteral("{\"1\":{\"0\":\"https://example.com/\"}}"));
+}
+
+// Double check that if we have two valid principals in a serialized JSON that
+// nullptr is returned
+TEST(PrincipalSerialization, TwoKeys)
+{
+  // Sanity check that this returns a system principal
+  nsCOMPtr<nsIPrincipal> systemPrincipal =
+      BasePrincipal::FromJSON("{\"3\":{}}"_ns);
+  ASSERT_EQ(BasePrincipal::Cast(systemPrincipal)->Kind(),
+            BasePrincipal::eSystemPrincipal);
+
+  // Sanity check that this returns a content principal
+  nsCOMPtr<nsIPrincipal> contentPrincipal =
+      BasePrincipal::FromJSON("{\"1\":{\"0\":\"https://mozilla.com\"}}"_ns);
+  ASSERT_EQ(BasePrincipal::Cast(contentPrincipal)->Kind(),
+            BasePrincipal::eContentPrincipal);
+
+  // Check both combined don't return a principal
+  nsCOMPtr<nsIPrincipal> combinedPrincipal = BasePrincipal::FromJSON(
+      "{\"1\":{\"0\":\"https://mozilla.com\"},\"3\":{}}"_ns);
+  ASSERT_EQ(nullptr, combinedPrincipal);
+}
+
+#endif  // ifndef MOZ_DEBUG
+
+TEST(PrincipalSerialization, ExpandedPrincipal)
+{
+  // Check basic Expandedprincipal works without OA
+  nsCOMPtr<nsIScriptSecurityManager> ssm =
+      nsScriptSecurityManager::GetScriptSecurityManager();
+
+  uint32_t length = 2;
+  nsTArray<nsCOMPtr<nsIPrincipal> > allowedDomains(length);
+  allowedDomains.SetLength(length);
+
+  nsAutoCString spec("https://mozilla.com");
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv =
+      ssm->CreateContentPrincipalFromOrigin(spec, getter_AddRefs(principal));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principal)->Kind(),
+            BasePrincipal::eContentPrincipal);
+  allowedDomains[0] = principal;
+
+  nsAutoCString spec2("https://mozilla.org");
+  nsCOMPtr<nsIPrincipal> principal2;
+  rv = ssm->CreateContentPrincipalFromOrigin(spec2, getter_AddRefs(principal2));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principal2)->Kind(),
+            BasePrincipal::eContentPrincipal);
+  allowedDomains[1] = principal2;
+
+  mozilla::OriginAttributes attrs;
+  RefPtr<ExpandedPrincipal> result =
+      ExpandedPrincipal::Create(allowedDomains, attrs);
+  ASSERT_EQ(BasePrincipal::Cast(result)->Kind(),
+            BasePrincipal::eExpandedPrincipal);
+
+  nsAutoCString JSON;
+  rv = BasePrincipal::Cast(result)->ToJSON(JSON);
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_STREQ(JSON.get(),
+               "{\"2\":{\"0\":[{\"1\":{\"0\":\"https://mozilla.com/"
+               "\"}},{\"1\":{\"0\":\"https://mozilla.org/\"}}]}}");
+
+  nsCOMPtr<nsIPrincipal> returnedPrincipal = BasePrincipal::FromJSON(JSON);
+  auto outPrincipal = BasePrincipal::Cast(returnedPrincipal);
+  ASSERT_EQ(outPrincipal->Kind(), BasePrincipal::eExpandedPrincipal);
+
+  ASSERT_TRUE(outPrincipal->FastSubsumesIgnoringFPD(principal));
+  ASSERT_TRUE(outPrincipal->FastSubsumesIgnoringFPD(principal2));
+
+  nsAutoCString specDev("https://mozilla.dev");
+  nsCOMPtr<nsIPrincipal> principalDev;
+  rv = ssm->CreateContentPrincipalFromOrigin(specDev,
+                                             getter_AddRefs(principalDev));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principalDev)->Kind(),
+            BasePrincipal::eContentPrincipal);
+
+  ASSERT_FALSE(outPrincipal->FastSubsumesIgnoringFPD(principalDev));
+}
+
+TEST(PrincipalSerialization, ExpandedPrincipalOA)
+{
+  // Check Expandedprincipal works with top level OA
+  nsCOMPtr<nsIScriptSecurityManager> ssm =
+      nsScriptSecurityManager::GetScriptSecurityManager();
+
+  uint32_t length = 2;
+  nsTArray<nsCOMPtr<nsIPrincipal> > allowedDomains(length);
+  allowedDomains.SetLength(length);
+
+  nsAutoCString spec("https://mozilla.com");
+  nsCOMPtr<nsIPrincipal> principal;
+  nsresult rv =
+      ssm->CreateContentPrincipalFromOrigin(spec, getter_AddRefs(principal));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principal)->Kind(),
+            BasePrincipal::eContentPrincipal);
+  allowedDomains[0] = principal;
+
+  nsAutoCString spec2("https://mozilla.org");
+  nsCOMPtr<nsIPrincipal> principal2;
+  rv = ssm->CreateContentPrincipalFromOrigin(spec2, getter_AddRefs(principal2));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principal2)->Kind(),
+            BasePrincipal::eContentPrincipal);
+  allowedDomains[1] = principal2;
+
+  mozilla::OriginAttributes attrs;
+  nsAutoCString suffix("^userContextId=1");
+  bool ok = attrs.PopulateFromSuffix(suffix);
+  ASSERT_TRUE(ok);
+
+  RefPtr<ExpandedPrincipal> result =
+      ExpandedPrincipal::Create(allowedDomains, attrs);
+  ASSERT_EQ(BasePrincipal::Cast(result)->Kind(),
+            BasePrincipal::eExpandedPrincipal);
+
+  nsAutoCString JSON;
+  rv = BasePrincipal::Cast(result)->ToJSON(JSON);
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_STREQ(JSON.get(),
+               "{\"2\":{\"0\":[{\"1\":{\"0\":\"https://mozilla.com/"
+               "\"}},{\"1\":{\"0\":\"https://mozilla.org/"
+               "\"}}],\"1\":\"^userContextId=1\"}}");
+
+  nsCOMPtr<nsIPrincipal> returnedPrincipal = BasePrincipal::FromJSON(JSON);
+  auto outPrincipal = BasePrincipal::Cast(returnedPrincipal);
+  ASSERT_EQ(outPrincipal->Kind(), BasePrincipal::eExpandedPrincipal);
+
+  ASSERT_TRUE(outPrincipal->FastSubsumesIgnoringFPD(principal));
+  ASSERT_TRUE(outPrincipal->FastSubsumesIgnoringFPD(principal2));
+
+  nsAutoCString specDev("https://mozilla.dev");
+  nsCOMPtr<nsIPrincipal> principalDev;
+  rv = ssm->CreateContentPrincipalFromOrigin(specDev,
+                                             getter_AddRefs(principalDev));
+  ASSERT_EQ(rv, NS_OK);
+  ASSERT_EQ(BasePrincipal::Cast(principalDev)->Kind(),
+            BasePrincipal::eContentPrincipal);
+
+  ASSERT_FALSE(outPrincipal->FastSubsumesIgnoringFPD(principalDev));
+}
diff --git a/caps/tests/gtest/TestRedirectChainURITruncation.cpp b/caps/tests/gtest/TestRedirectChainURITruncation.cpp
new file mode 100644
index 0000000000..34c633499c
--- /dev/null
+++ b/caps/tests/gtest/TestRedirectChainURITruncation.cpp
@@ -0,0 +1,231 @@
+/* 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/. */
+#include "gtest/gtest.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/ContentPrincipal.h"
+#include "mozilla/NullPrincipal.h"
+#include "mozilla/SystemPrincipal.h"
+#include "mozilla/ExpandedPrincipal.h"
+#include "nsContentUtils.h"
+#include "mozilla/LoadInfo.h"
+
+namespace mozilla {
+
+void checkPrincipalTruncation(nsIPrincipal* aPrincipal,
+                              const nsACString& aExpectedSpec = ""_ns,
+                              const nsTArray<nsCString>& aExpectedSpecs = {}) {
+  nsCOMPtr<nsIPrincipal> truncatedPrincipal =
+      net::CreateTruncatedPrincipal(aPrincipal);
+  ASSERT_TRUE(truncatedPrincipal);
+
+  if (aPrincipal->IsSystemPrincipal()) {
+    ASSERT_TRUE(truncatedPrincipal->IsSystemPrincipal());
+    return;
+  }
+
+  if (aPrincipal->GetIsNullPrincipal()) {
+    nsCOMPtr<nsIPrincipal> precursorPrincipal =
+        aPrincipal->GetPrecursorPrincipal();
+
+    nsAutoCString principalSpecEnding("}");
+    nsAutoCString expectedTestSpec(aExpectedSpec);
+    if (!aExpectedSpec.IsEmpty()) {
+      principalSpecEnding += "?"_ns;
+      expectedTestSpec += "/"_ns;
+    }
+
+    if (precursorPrincipal) {
+      nsAutoCString precursorSpec;
+      precursorPrincipal->GetAsciiSpec(precursorSpec);
+      ASSERT_TRUE(precursorSpec.Equals(expectedTestSpec));
+    }
+
+    // NullPrincipals have UUIDs as part of their scheme i.e.
+    // moz-nullprincipal:{9bebdabb-828a-4284-8b00-432a968c6e42}
+    // To avoid having to know the UUID beforehand we check the principal's spec
+    // before and after the UUID
+    nsAutoCString principalSpec;
+    truncatedPrincipal->GetAsciiSpec(principalSpec);
+    ASSERT_TRUE(StringBeginsWith(principalSpec, "moz-nullprincipal:{"_ns));
+    ASSERT_TRUE(
+        StringEndsWith(principalSpec, principalSpecEnding + aExpectedSpec));
+    return;
+  }
+
+  if (aPrincipal->GetIsExpandedPrincipal()) {
+    const nsTArray<nsCOMPtr<nsIPrincipal>>& truncatedAllowList =
+        BasePrincipal::Cast(truncatedPrincipal)
+            ->As<ExpandedPrincipal>()
+            ->AllowList();
+
+    for (size_t i = 0; i < aExpectedSpecs.Length(); ++i) {
+      nsAutoCString principalSpec;
+      truncatedAllowList[i]->GetAsciiSpec(principalSpec);
+      ASSERT_TRUE(principalSpec.Equals(aExpectedSpecs[i]));
+    }
+    return;
+  }
+
+  if (aPrincipal->GetIsContentPrincipal()) {
+    nsAutoCString principalSpec;
+    truncatedPrincipal->GetAsciiSpec(principalSpec);
+    ASSERT_TRUE(principalSpec.Equals(aExpectedSpec));
+    return;
+  }
+
+  // Tests should not reach this point
+  ADD_FAILURE();
+}
+
+void checkPrincipalTruncation(nsIPrincipal* aPrincipal,
+                              const nsTArray<nsCString>& aExpectedSpecs = {}) {
+  checkPrincipalTruncation(aPrincipal, ""_ns, aExpectedSpecs);
+}
+
+TEST(RedirectChainURITruncation, ContentPrincipal)
+{
+  // ======================= HTTP Scheme =======================
+  nsAutoCString httpSpec(
+      "http://root:toor@www.example.com:200/foo/bar/baz.html?qux#thud");
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), httpSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  nsCOMPtr<nsIPrincipal> principal;
+  OriginAttributes attrs;
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal,
+                           "http://www.example.com:200/foo/bar/baz.html"_ns);
+
+  // ======================= HTTPS Scheme =======================
+  nsAutoCString httpsSpec(
+      "https://root:toor@www.example.com:200/foo/bar/baz.html?qux#thud");
+  rv = NS_NewURI(getter_AddRefs(uri), httpsSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal,
+                           "https://www.example.com:200/foo/bar/baz.html"_ns);
+
+  // ======================= View Source Scheme =======================
+  nsAutoCString viewSourceSpec(
+      "view-source:https://root:toor@www.example.com:200/foo/bar/"
+      "baz.html?qux#thud");
+  rv = NS_NewURI(getter_AddRefs(uri), viewSourceSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(
+      principal, "view-source:https://www.example.com:200/foo/bar/baz.html"_ns);
+
+  // ======================= About Scheme =======================
+  nsAutoCString aboutSpec("about:config");
+  rv = NS_NewURI(getter_AddRefs(uri), aboutSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, "about:config"_ns);
+
+  // ======================= Resource Scheme =======================
+  nsAutoCString resourceSpec("resource://testing/");
+  rv = NS_NewURI(getter_AddRefs(uri), resourceSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, "resource://testing/"_ns);
+
+  // ======================= Chrome Scheme =======================
+  nsAutoCString chromeSpec("chrome://foo/content/bar.xul");
+  rv = NS_NewURI(getter_AddRefs(uri), chromeSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  principal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, "chrome://foo/content/bar.xul"_ns);
+}
+
+TEST(RedirectChainURITruncation, NullPrincipal)
+{
+  // ======================= NullPrincipal =======================
+  nsCOMPtr<nsIPrincipal> principal =
+      NullPrincipal::CreateWithoutOriginAttributes();
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, ""_ns);
+
+  // ======================= NullPrincipal & Precursor =======================
+  nsAutoCString precursorSpec(
+      "https://root:toor@www.example.com:200/foo/bar/baz.html?qux#thud");
+
+  nsCOMPtr<nsIURI> precursorURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(precursorURI), precursorSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  OriginAttributes attrs;
+  nsCOMPtr<nsIPrincipal> precursorPrincipal =
+      BasePrincipal::CreateContentPrincipal(precursorURI, attrs);
+  principal = NullPrincipal::CreateWithInheritedAttributes(precursorPrincipal);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, "https://www.example.com:200"_ns);
+}
+
+TEST(RedirectChainURITruncation, SystemPrincipal)
+{
+  nsCOMPtr<nsIPrincipal> principal = nsContentUtils::GetSystemPrincipal();
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, ""_ns);
+}
+
+TEST(RedirectChainURITruncation, ExtendedPrincipal)
+{
+  // ======================= HTTP Scheme =======================
+  nsAutoCString httpSpec(
+      "http://root:toor@www.example.com:200/foo/bar/baz.html?qux#thud");
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), httpSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  nsCOMPtr<nsIPrincipal> firstContentPrincipal;
+  OriginAttributes attrs;
+  firstContentPrincipal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(firstContentPrincipal);
+
+  // ======================= HTTPS Scheme =======================
+  nsCOMPtr<nsIPrincipal> secondContentPrincipal;
+  nsAutoCString httpsSpec(
+      "https://root:toor@www.example.com:200/foo/bar/baz.html?qux#thud");
+  rv = NS_NewURI(getter_AddRefs(uri), httpsSpec);
+  ASSERT_EQ(rv, NS_OK);
+
+  secondContentPrincipal = BasePrincipal::CreateContentPrincipal(uri, attrs);
+  ASSERT_TRUE(secondContentPrincipal);
+
+  // ======================= ExpandedPrincipal =======================
+  const nsTArray<nsCString>& expectedSpecs = {
+      "http://www.example.com:200/foo/bar/baz.html"_ns,
+      "https://www.example.com:200/foo/bar/baz.html"_ns,
+  };
+  nsTArray<nsCOMPtr<nsIPrincipal>> allowList = {firstContentPrincipal,
+                                                secondContentPrincipal};
+  nsCOMPtr<nsIPrincipal> principal =
+      ExpandedPrincipal::Create(allowList, attrs);
+  ASSERT_TRUE(principal);
+
+  checkPrincipalTruncation(principal, expectedSpecs);
+}
+
+}  // namespace mozilla
diff --git a/caps/tests/gtest/moz.build b/caps/tests/gtest/moz.build
new file mode 100644
index 0000000000..10b1a66f3b
--- /dev/null
+++ b/caps/tests/gtest/moz.build
@@ -0,0 +1,18 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+UNIFIED_SOURCES += [
+    "TestBackgroundThreadPrincipal.cpp",
+    "TestNullPrincipalPrecursor.cpp",
+    "TestOriginAttributes.cpp",
+    "TestPrincipalAttributes.cpp",
+    "TestPrincipalSerialization.cpp",
+    "TestRedirectChainURITruncation.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul-gtest"
diff --git a/caps/tests/mochitest/browser.toml b/caps/tests/mochitest/browser.toml
new file mode 100644
index 0000000000..559f766dc2
--- /dev/null
+++ b/caps/tests/mochitest/browser.toml
@@ -0,0 +1,5 @@
+[DEFAULT]
+
+["browser_aboutOrigin.js"]
+
+["browser_checkloaduri.js"]
diff --git a/caps/tests/mochitest/browser_aboutOrigin.js b/caps/tests/mochitest/browser_aboutOrigin.js
new file mode 100644
index 0000000000..fc2e2d8f53
--- /dev/null
+++ b/caps/tests/mochitest/browser_aboutOrigin.js
@@ -0,0 +1,12 @@
+"use strict";
+
+let tests = ["about:robots?foo", "about:robots#foo", "about:robots?foo#bar"];
+tests.forEach(async test => {
+  add_task(async () => {
+    await BrowserTestUtils.withNewTab(test, async browser => {
+      await SpecialPowers.spawn(browser, [], () => {
+        is(content.document.nodePrincipal.origin, "about:robots");
+      });
+    });
+  });
+});
diff --git a/caps/tests/mochitest/browser_checkloaduri.js b/caps/tests/mochitest/browser_checkloaduri.js
new file mode 100644
index 0000000000..11ff2d1a08
--- /dev/null
+++ b/caps/tests/mochitest/browser_checkloaduri.js
@@ -0,0 +1,393 @@
+"use strict";
+
+let ssm = Services.scriptSecurityManager;
+// This will show a directory listing, but we never actually load these so that's OK.
+const kDummyPage = getRootDirectory(gTestPath);
+
+const kAboutPagesRegistered = Promise.all([
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-chrome-privs",
+    kDummyPage,
+    Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-chrome-privs2",
+    kDummyPage,
+    Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-unknown-linkable",
+    kDummyPage,
+    Ci.nsIAboutModule.MAKE_LINKABLE | Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-unknown-linkable2",
+    kDummyPage,
+    Ci.nsIAboutModule.MAKE_LINKABLE | Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-unknown-unlinkable",
+    kDummyPage,
+    Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-unknown-unlinkable2",
+    kDummyPage,
+    Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-content-unlinkable",
+    kDummyPage,
+    Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+      Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-content-unlinkable2",
+    kDummyPage,
+    Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+      Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-content-linkable",
+    kDummyPage,
+    Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+      Ci.nsIAboutModule.MAKE_LINKABLE |
+      Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+  BrowserTestUtils.registerAboutPage(
+    registerCleanupFunction,
+    "test-content-linkable2",
+    kDummyPage,
+    Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+      Ci.nsIAboutModule.MAKE_LINKABLE |
+      Ci.nsIAboutModule.ALLOW_SCRIPT
+  ),
+]);
+
+const URLs = new Map([
+  [
+    "http://www.example.com",
+    [
+      // For each of these entries, the booleans represent whether the parent URI can:
+      // - load them
+      // - load them without principal inheritance
+      // - whether the URI can be created at all (some protocol handlers will
+      //   refuse to create certain variants)
+      ["http://www.example2.com", true, true, true],
+      ["https://www.example2.com", true, true, true],
+      ["moz-icon:file:///foo/bar/baz.exe", false, false, true],
+      ["moz-icon://.exe", false, false, true],
+      ["chrome://foo/content/bar.xul", false, false, true],
+      ["view-source:http://www.example2.com", false, false, true],
+      ["view-source:https://www.example2.com", false, false, true],
+      ["data:text/html,Hi", true, false, true],
+      ["view-source:data:text/html,Hi", false, false, true],
+      ["javascript:alert('hi')", true, false, true],
+      ["moz://a", false, false, true],
+      ["about:test-chrome-privs", false, false, true],
+      ["about:test-unknown-unlinkable", false, false, true],
+      ["about:test-content-unlinkable", false, false, true],
+      ["about:test-content-linkable", true, true, true],
+      // Because this page doesn't have SAFE_FOR_UNTRUSTED, the web can't link to it:
+      ["about:test-unknown-linkable", false, false, true],
+    ],
+  ],
+  [
+    "view-source:http://www.example.com",
+    [
+      ["http://www.example2.com", true, true, true],
+      ["https://www.example2.com", true, true, true],
+      ["moz-icon:file:///foo/bar/baz.exe", false, false, true],
+      ["moz-icon://.exe", false, false, true],
+      ["chrome://foo/content/bar.xul", false, false, true],
+      ["view-source:http://www.example2.com", true, true, true],
+      ["view-source:https://www.example2.com", true, true, true],
+      ["data:text/html,Hi", true, false, true],
+      ["view-source:data:text/html,Hi", true, false, true],
+      ["javascript:alert('hi')", true, false, true],
+      ["moz://a", false, false, true],
+      ["about:test-chrome-privs", false, false, true],
+      ["about:test-unknown-unlinkable", false, false, true],
+      ["about:test-content-unlinkable", false, false, true],
+      ["about:test-content-linkable", true, true, true],
+      // Because this page doesn't have SAFE_FOR_UNTRUSTED, the web can't link to it:
+      ["about:test-unknown-linkable", false, false, true],
+    ],
+  ],
+  // about: related tests.
+  [
+    "about:test-chrome-privs",
+    [
+      ["about:test-chrome-privs", true, true, true],
+      ["about:test-chrome-privs2", true, true, true],
+      ["about:test-chrome-privs2?foo#bar", true, true, true],
+      ["about:test-chrome-privs2?foo", true, true, true],
+      ["about:test-chrome-privs2#bar", true, true, true],
+
+      ["about:test-unknown-unlinkable", true, true, true],
+
+      ["about:test-content-unlinkable", true, true, true],
+      ["about:test-content-unlinkable?foo", true, true, true],
+      ["about:test-content-unlinkable?foo#bar", true, true, true],
+      ["about:test-content-unlinkable#bar", true, true, true],
+
+      ["about:test-content-linkable", true, true, true],
+
+      ["about:test-unknown-linkable", true, true, true],
+      ["moz-icon:file:///foo/bar/baz.exe", true, true, true],
+      ["moz-icon://.exe", true, true, true],
+    ],
+  ],
+  [
+    "about:test-unknown-unlinkable",
+    [
+      ["about:test-chrome-privs", false, false, true],
+
+      // Can link to ourselves:
+      ["about:test-unknown-unlinkable", true, true, true],
+      // Can't link to unlinkable content if we're not sure it's privileged:
+      ["about:test-unknown-unlinkable2", false, false, true],
+
+      ["about:test-content-unlinkable", true, true, true],
+      ["about:test-content-unlinkable2", true, true, true],
+      ["about:test-content-unlinkable2?foo", true, true, true],
+      ["about:test-content-unlinkable2?foo#bar", true, true, true],
+      ["about:test-content-unlinkable2#bar", true, true, true],
+
+      ["about:test-content-linkable", true, true, true],
+
+      // Because this page doesn't have SAFE_FOR_UNTRUSTED, the web can't link to it:
+      ["about:test-unknown-linkable", false, false, true],
+    ],
+  ],
+  [
+    "about:test-content-unlinkable",
+    [
+      ["about:test-chrome-privs", false, false, true],
+
+      // Can't link to unlinkable content if we're not sure it's privileged:
+      ["about:test-unknown-unlinkable", false, false, true],
+
+      ["about:test-content-unlinkable", true, true, true],
+      ["about:test-content-unlinkable2", true, true, true],
+      ["about:test-content-unlinkable2?foo", true, true, true],
+      ["about:test-content-unlinkable2?foo#bar", true, true, true],
+      ["about:test-content-unlinkable2#bar", true, true, true],
+
+      ["about:test-content-linkable", true, true, true],
+      ["about:test-unknown-linkable", false, false, true],
+    ],
+  ],
+  [
+    "about:test-unknown-linkable",
+    [
+      ["about:test-chrome-privs", false, false, true],
+
+      // Linkable content can't link to unlinkable content.
+      ["about:test-unknown-unlinkable", false, false, true],
+
+      ["about:test-content-unlinkable", false, false, true],
+      ["about:test-content-unlinkable2", false, false, true],
+      ["about:test-content-unlinkable2?foo", false, false, true],
+      ["about:test-content-unlinkable2?foo#bar", false, false, true],
+      ["about:test-content-unlinkable2#bar", false, false, true],
+
+      // ... but it can link to other linkable content.
+      ["about:test-content-linkable", true, true, true],
+
+      // Can link to ourselves:
+      ["about:test-unknown-linkable", true, true, true],
+
+      // Because this page doesn't have SAFE_FOR_UNTRUSTED, the web can't link to it:
+      ["about:test-unknown-linkable2", false, false, true],
+    ],
+  ],
+  [
+    "about:test-content-linkable",
+    [
+      ["about:test-chrome-privs", false, false, true],
+
+      // Linkable content can't link to unlinkable content.
+      ["about:test-unknown-unlinkable", false, false, true],
+
+      ["about:test-content-unlinkable", false, false, true],
+
+      // ... but it can link to itself and other linkable content.
+      ["about:test-content-linkable", true, true, true],
+      ["about:test-content-linkable2", true, true, true],
+
+      // Because this page doesn't have SAFE_FOR_UNTRUSTED, the web can't link to it:
+      ["about:test-unknown-linkable", false, false, true],
+    ],
+  ],
+]);
+
+function testURL(
+  source,
+  target,
+  canLoad,
+  canLoadWithoutInherit,
+  canCreate,
+  flags
+) {
+  function getPrincipalDesc(principal) {
+    if (principal.spec != "") {
+      return principal.spec;
+    }
+    if (principal.isSystemPrincipal) {
+      return "system principal";
+    }
+    if (principal.isNullPrincipal) {
+      return "null principal";
+    }
+    return "unknown principal";
+  }
+  let threw = false;
+  let targetURI;
+  try {
+    targetURI = Services.io.newURI(target);
+  } catch (ex) {
+    ok(
+      !canCreate,
+      "Shouldn't be passing URIs that we can't create. Failed to create: " +
+        target
+    );
+    return;
+  }
+  ok(
+    canCreate,
+    "Created a URI for " +
+      target +
+      " which should " +
+      (canCreate ? "" : "not ") +
+      "be possible."
+  );
+  try {
+    ssm.checkLoadURIWithPrincipal(source, targetURI, flags);
+  } catch (ex) {
+    info(ex.message);
+    threw = true;
+  }
+  let inheritDisallowed = flags & ssm.DISALLOW_INHERIT_PRINCIPAL;
+  let shouldThrow = inheritDisallowed ? !canLoadWithoutInherit : !canLoad;
+  ok(
+    threw == shouldThrow,
+    "Should " +
+      (shouldThrow ? "" : "not ") +
+      "throw an error when loading " +
+      target +
+      " from " +
+      getPrincipalDesc(source) +
+      (inheritDisallowed ? " without" : " with") +
+      " principal inheritance."
+  );
+}
+
+add_task(async function () {
+  // In this test we want to verify both http and https load
+  // restrictions, hence we explicitly switch off the https-first
+  // upgrading mechanism.
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.security.https_first", false]],
+  });
+
+  await kAboutPagesRegistered;
+  let baseFlags = ssm.STANDARD | ssm.DONT_REPORT_ERRORS;
+  for (let [sourceString, targetsAndExpectations] of URLs) {
+    let source;
+    if (sourceString.startsWith("about:test-chrome-privs")) {
+      source = ssm.getSystemPrincipal();
+    } else {
+      source = ssm.createContentPrincipal(Services.io.newURI(sourceString), {});
+    }
+    for (let [
+      target,
+      canLoad,
+      canLoadWithoutInherit,
+      canCreate,
+    ] of targetsAndExpectations) {
+      testURL(
+        source,
+        target,
+        canLoad,
+        canLoadWithoutInherit,
+        canCreate,
+        baseFlags
+      );
+      testURL(
+        source,
+        target,
+        canLoad,
+        canLoadWithoutInherit,
+        canCreate,
+        baseFlags | ssm.DISALLOW_INHERIT_PRINCIPAL
+      );
+    }
+  }
+
+  // Now test blob URIs, which we need to do in-content.
+  await BrowserTestUtils.withNewTab(
+    "http://www.example.com/",
+    async function (browser) {
+      await SpecialPowers.spawn(
+        browser,
+        [testURL.toString()],
+        async function (testURLFn) {
+          // eslint-disable-next-line no-shadow , no-eval
+          let testURL = eval("(" + testURLFn + ")");
+          // eslint-disable-next-line no-shadow
+          let ssm = Services.scriptSecurityManager;
+          // eslint-disable-next-line no-shadow
+          let baseFlags = ssm.STANDARD | ssm.DONT_REPORT_ERRORS;
+          // eslint-disable-next-line no-unused-vars
+          let b = new content.Blob(["I am a blob"]);
+          let contentBlobURI = content.URL.createObjectURL(b);
+          let contentPrincipal = content.document.nodePrincipal;
+          // Loading this blob URI from the content page should work:
+          testURL(
+            contentPrincipal,
+            contentBlobURI,
+            true,
+            true,
+            true,
+            baseFlags
+          );
+          testURL(
+            contentPrincipal,
+            contentBlobURI,
+            true,
+            true,
+            true,
+            baseFlags | ssm.DISALLOW_INHERIT_PRINCIPAL
+          );
+
+          testURL(
+            contentPrincipal,
+            "view-source:" + contentBlobURI,
+            false,
+            false,
+            true,
+            baseFlags
+          );
+          testURL(
+            contentPrincipal,
+            "view-source:" + contentBlobURI,
+            false,
+            false,
+            true,
+            baseFlags | ssm.DISALLOW_INHERIT_PRINCIPAL
+          );
+        }
+      );
+    }
+  );
+});
diff --git a/caps/tests/mochitest/chrome.toml b/caps/tests/mochitest/chrome.toml
new file mode 100644
index 0000000000..9ad9ebc652
--- /dev/null
+++ b/caps/tests/mochitest/chrome.toml
@@ -0,0 +1,15 @@
+[DEFAULT]
+skip-if = ["os == 'android'"]
+support-files = [
+  "file_data.txt",
+  "file_disableScript.html",
+  "!/caps/tests/mochitest/file_data.txt",
+  "!/caps/tests/mochitest/file_disableScript.html",
+]
+
+["test_addonMayLoad.html"]
+
+["test_bug995943.xhtml"]
+skip-if = ["(verify && debug && (os == 'mac'))"]
+
+["test_disableScript.xhtml"]
diff --git a/caps/tests/mochitest/file_bug1367586-followon.html b/caps/tests/mochitest/file_bug1367586-followon.html
new file mode 100644
index 0000000000..3b648ce746
--- /dev/null
+++ b/caps/tests/mochitest/file_bug1367586-followon.html
@@ -0,0 +1 @@
+<body>Follow-on navigation content</body>
diff --git a/caps/tests/mochitest/file_bug1367586-redirect.sjs b/caps/tests/mochitest/file_bug1367586-redirect.sjs
new file mode 100644
index 0000000000..12a980155f
--- /dev/null
+++ b/caps/tests/mochitest/file_bug1367586-redirect.sjs
@@ -0,0 +1,8 @@
+function handleRequest(aRequest, aResponse) {
+  aResponse.setStatusLine(aRequest.httpVersion, 302, "Moved");
+  aResponse.setHeader(
+    "Location",
+    "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-target.html"
+  );
+  aResponse.write("To be redirected to target");
+}
diff --git a/caps/tests/mochitest/file_bug1367586-target.html b/caps/tests/mochitest/file_bug1367586-target.html
new file mode 100644
index 0000000000..e2a2fde20d
--- /dev/null
+++ b/caps/tests/mochitest/file_bug1367586-target.html
@@ -0,0 +1,6 @@
+<head><script>
+window.addEventListener("pageshow", function(event) {
+    parent.ok(!event.persisted, "Should not load from bfcache");
+});
+</script></head>
+<body>Redirect target content</body>
diff --git a/caps/tests/mochitest/file_data.txt b/caps/tests/mochitest/file_data.txt
new file mode 100644
index 0000000000..26d7bd8488
--- /dev/null
+++ b/caps/tests/mochitest/file_data.txt
@@ -0,0 +1 @@
+server data fetched over XHR
diff --git a/caps/tests/mochitest/file_disableScript.html b/caps/tests/mochitest/file_disableScript.html
new file mode 100644
index 0000000000..f4888cd586
--- /dev/null
+++ b/caps/tests/mochitest/file_disableScript.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script>
+var gFiredOnload = false;
+var gFiredOnclick = false;
+</script>
+</head>
+<body onload="gFiredOnload = true;" onclick="gFiredOnclick = true;">
+</body>
+</html>
diff --git a/caps/tests/mochitest/mochitest.toml b/caps/tests/mochitest/mochitest.toml
new file mode 100644
index 0000000000..c9e72c305b
--- /dev/null
+++ b/caps/tests/mochitest/mochitest.toml
@@ -0,0 +1,26 @@
+[DEFAULT]
+support-files = [
+  "file_bug1367586-followon.html",
+  "file_bug1367586-redirect.sjs",
+  "file_bug1367586-target.html",
+  "file_data.txt",
+  "file_disableScript.html",
+  "!/js/xpconnect/tests/mochitest/file_empty.html",
+]
+
+["test_bug246699.html"]
+
+["test_bug292789.html"]
+skip-if = ["os == 'android'"]
+
+["test_bug423375.html"]
+
+["test_bug470804.html"]
+
+["test_bug1367586.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_disallowInheritPrincipal.html"]
diff --git a/caps/tests/mochitest/resource_test_file.html b/caps/tests/mochitest/resource_test_file.html
new file mode 100644
index 0000000000..8201bd70e0
--- /dev/null
+++ b/caps/tests/mochitest/resource_test_file.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<html><head><title>resource test file</title></head><body></body></html>
diff --git a/caps/tests/mochitest/test_addonMayLoad.html b/caps/tests/mochitest/test_addonMayLoad.html
new file mode 100644
index 0000000000..2d5e5e59f1
--- /dev/null
+++ b/caps/tests/mochitest/test_addonMayLoad.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1180921
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1180921</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1180921 */
+  let module = Cu.getGlobalForObject(Services);
+  let ssm = Services.scriptSecurityManager;
+
+  function StubPolicy(id, subdomain) {
+    /* globals MatchPatternSet */
+    return new module.WebExtensionPolicy({
+      id,
+      mozExtensionHostname: id,
+      baseURL: `file:///{id}`,
+
+      allowedOrigins: new MatchPatternSet([`*://${subdomain}.example.org/*`]),
+      localizeCallback(string) {},
+    });
+  }
+
+  /* globals WebExtensionPolicy */
+  let policyA = StubPolicy("addona", "test1");
+  let policyB = StubPolicy("addonb", "test2");
+  policyA.active = true;
+  policyB.active = true;
+
+  SimpleTest.waitForExplicitFinish();
+  SimpleTest.registerCleanupFunction(function() {
+    policyA.active = false;
+    policyB.active = false;
+  });
+
+  function tryLoad(sb, uri) {
+    let p = new Promise(function(resolve, reject) {
+      Cu.exportFunction(resolve, sb, { defineAs: "finish" });
+      Cu.exportFunction(reject, sb, { defineAs: "error" });
+      sb.eval("try { (function () { " +
+              "  var xhr = new XMLHttpRequest();" +
+              "  xhr.onreadystatechange = function() { if (xhr.readyState == XMLHttpRequest.DONE) { finish(xhr.status == 200); } };" +
+              "  xhr.open('GET', '" + uri + "', true);" +
+              "  xhr.send();" +
+              "})() } catch (e) { error(e); }");
+    });
+    return p;
+  }
+
+  let addonA = new Cu.Sandbox(ssm.createContentPrincipal(Services.io.newURI("moz-extension://addonA/"), {}),
+                              {wantGlobalProperties: ["XMLHttpRequest"]});
+  let addonB = new Cu.Sandbox(ssm.createContentPrincipal(Services.io.newURI("moz-extension://addonB/"), {}),
+                              {wantGlobalProperties: ["XMLHttpRequest"]});
+
+  function uriForDomain(d) { return d + "/tests/caps/tests/mochitest/file_data.txt"; }
+
+  tryLoad(addonA, uriForDomain("http://test4.example.org"))
+  .then(function(success) {
+    ok(!success, "cross-origin load should fail for addon A");
+    return tryLoad(addonA, uriForDomain("http://test1.example.org"));
+  }).then(function(success) {
+    ok(success, "allowlisted cross-origin load of test1 should succeed for addon A");
+    return tryLoad(addonB, uriForDomain("http://test1.example.org"));
+  }).then(function(success) {
+    ok(!success, "non-allowlisted cross-origin load of test1 should fail for addon B");
+    return tryLoad(addonB, uriForDomain("http://test2.example.org"));
+  }).then(function(success) {
+    ok(success, "allowlisted cross-origin load of test2 should succeed for addon B");
+    return tryLoad(addonA, uriForDomain("http://test2.example.org"));
+  }).then(function(success) {
+    ok(!success, "non-allowlisted cross-origin load of test2 should fail for addon A");
+    SimpleTest.finish();
+  }, function(e) {
+    ok(false, "Rejected promise chain: " + e);
+    SimpleTest.finish();
+  });
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1180921">Mozilla Bug 1180921</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug1367586.html b/caps/tests/mochitest/test_bug1367586.html
new file mode 100644
index 0000000000..d95693c94d
--- /dev/null
+++ b/caps/tests/mochitest/test_bug1367586.html
@@ -0,0 +1,50 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1367586
+-->
+<head>
+  <title>Test for Bug 1367586</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<iframe id="load-frame"></iframe>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+var frm = document.getElementById("load-frame");
+var step = 0;
+
+window.addEventListener("load", () => {
+  frm.contentWindow.location = "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-redirect.sjs";
+  frm.addEventListener("load", function() {
+    ++step;
+    SimpleTest.executeSoon((function(_step, _frm) {
+      switch (_step) {
+      case 1:
+        is(_frm.contentWindow.location.href, "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-target.html",
+           "Redirected to the expected target in step 1");
+        _frm.contentWindow.location = "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-followon.html";
+        break;
+      case 2:
+        is(_frm.contentWindow.location.href, "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-followon.html",
+           "Navigated to the expected URL in step 2");
+        _frm.contentWindow.history.back();
+        break;
+      case 3:
+        is(_frm.contentWindow.location.href, "http://mochi.test:8888/tests/caps/tests/mochitest/file_bug1367586-target.html",
+           "Seeing the correct URL when navigating back in step 3");
+        SimpleTest.finish();
+        break;
+      }
+    }).bind(window, step, frm));
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug246699.html b/caps/tests/mochitest/test_bug246699.html
new file mode 100644
index 0000000000..9ff25c110a
--- /dev/null
+++ b/caps/tests/mochitest/test_bug246699.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=246699
+-->
+<head>
+  <title>Test for Bug 246699</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=246699">Mozilla Bug 246699</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe id="load-frame"></iframe>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/**
+ * Test for Bug 246699
+ * (should produce stack information for caps errors)
+ */
+function isError(e) {
+  return e.constructor.name === "Error" || e.constructor.name === "TypeError";
+}
+
+function hasStack(e) {
+  return isError(e) && /inciteCaps/.test(e.stack);
+}
+
+function inciteCaps(f) {
+    try {
+        f();
+        return "operation succeeded";
+    } catch (e) {
+        if (hasStack(e)) {
+          return "denied-stack";
+        }
+        return "unexpected: " + e;
+    }
+}
+
+function tryChromeLoad() {
+    window.frames[0].location = "chrome://global/content/mozilla.html";
+}
+
+function tryComponentsClasses() {
+    return SpecialPowers.unwrap(SpecialPowers.Cc)["@mozilla.org/dummy;1"];
+}
+
+
+is(inciteCaps(tryChromeLoad), "denied-stack",
+   "should get stack for content-loading-chrome rejection");
+is(inciteCaps(tryComponentsClasses), "denied-stack",
+   "should get stack for SpecialPowers.Components.classes rejection");
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug292789.html b/caps/tests/mochitest/test_bug292789.html
new file mode 100644
index 0000000000..cd177dfd5b
--- /dev/null
+++ b/caps/tests/mochitest/test_bug292789.html
@@ -0,0 +1,121 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=292789
+-->
+<head>
+  <title>Test for Bug 292789</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=292789">Mozilla Bug 292789</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <script src="chrome://global/content/treeUtils.js"></script>
+  <script type="application/javascript" src="chrome://mozapps/content/update/history.js"></script>
+  <script id="resjs" type="application/javascript"></script>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 292789
+ *
+ * Selectively allow access to allowlisted chrome packages
+ * even for ALLOW_CHROME mechanisms (<script>, <img> etc)
+ */
+
+/* import-globals-from ../../../toolkit/content/treeUtils.js */
+/* import-globals-from ../../../toolkit/mozapps/update/content/history.js */
+
+SimpleTest.waitForExplicitFinish();
+
+let ChromeUtils = {
+  import() { return {}; },
+};
+
+/** <script src=""> test */
+function testScriptSrc(aCallback) {
+    is(typeof gTreeUtils.sort, "function",
+       "content can still load <script> from chrome://global");
+
+    /** Try to find an export from history.js.  We will find it if it is
+     *  improperly not blocked, otherwise it will be "undefined".
+     */
+    is(typeof gUpdateHistory, "undefined",
+       "content should not be able to load <script> from chrome://mozapps");
+
+    /** make sure the last one didn't pass because someone
+     *  moved history.js
+     */
+    var resjs = document.getElementById("resjs");
+    resjs.onload = scriptOnload;
+    resjs.src = "resource://gre/chrome/toolkit/content/mozapps/update/history.js";
+    document.getElementById("content").appendChild(resjs);
+
+    function scriptOnload() {
+      is(typeof gUpdateHistory.onLoad, "function",
+         "history.js has not moved unexpectedly");
+
+      // trigger the callback
+      if (aCallback)
+        aCallback();
+    }
+}
+
+/** <img src=""> tests */
+var img_global = "chrome://global/skin/media/error.png";
+var img_mozapps = "chrome://mozapps/skin/extensions/extensionGeneric.svg";
+var res_mozapps = "resource://gre/chrome/toolkit/skin/classic/mozapps/extensions/extensionGeneric.svg";
+
+var imgTests = [[img_global, "success"],
+                [img_mozapps, "fail"],
+                [res_mozapps, "success"]];
+
+var curImgTest = 0;
+
+function runImgTest() {
+    var test = imgTests[curImgTest++];
+    var callback = curImgTest == imgTests.length ? finishTest : runImgTest;
+    loadImage(test[0], test[1], callback);
+}
+
+function finishTest() {
+  SimpleTest.finish();
+}
+
+function fail(event) {
+    is("fail", event.target.expected,
+       "content should not be allowed to load " + event.target.src);
+    if (event.target.callback)
+      event.target.callback();
+}
+
+function success(event) {
+    is("success", event.target.expected,
+       "content should be able to load " + event.target.src);
+    if (event.target.callback)
+      event.target.callback();
+}
+
+function loadImage(uri, expect, callback) {
+    var img = document.createElement("img");
+    img.onerror = fail;
+    img.onload = success;
+    img.expected = expect;
+    img.callback = callback;
+    img.src = uri;
+    // document.getElementById("content").appendChild(img);
+}
+
+// Start off the script src test, and have it start the img tests when complete.
+// Temporarily allow content to access all resource:// URIs.
+SpecialPowers.pushPrefEnv({
+  set: [
+    ["security.all_resource_uri_content_accessible", true],
+  ],
+}, () => testScriptSrc(runImgTest));
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug423375.html b/caps/tests/mochitest/test_bug423375.html
new file mode 100644
index 0000000000..2ae1dfb923
--- /dev/null
+++ b/caps/tests/mochitest/test_bug423375.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=423375
+-->
+<head>
+  <title>Test for Bug 423375</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=423375">Mozilla Bug 423375</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe id="load-frame"></iframe>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/**
+ *Test for Bug 423375
+ *(content shouldn't be able to load chrome: or resource:)
+ */
+function tryLoad(url) {
+    try {
+        window.frames[0].location = url;
+        return "loaded";
+    } catch (e) {
+        if (/Access.*denied/.test(String(e))) {
+          return "denied";
+        }
+        return "unexpected: " + e;
+    }
+}
+
+is(tryLoad("chrome://global/content/mozilla.html"), "denied",
+   "content should have been prevented from loading chrome: URL");
+is(tryLoad("resource://gre-resources/html.css"), "denied",
+   "content should have been prevented from loading resource: URL");
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug470804.html b/caps/tests/mochitest/test_bug470804.html
new file mode 100644
index 0000000000..26da479af6
--- /dev/null
+++ b/caps/tests/mochitest/test_bug470804.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=470804
+-->
+<head>
+  <title>Test for Bug 470804</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=470804">Mozilla Bug 470804</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 470804
+    Passing a null targetURL to checkLoadURIWithPrincipal shouldn't crash
+ */
+
+const nsIScriptSecurityManager = SpecialPowers.Ci.nsIScriptSecurityManager;
+var secMan = SpecialPowers.Services.scriptSecurityManager;
+var principal = SpecialPowers.wrap(document).nodePrincipal;
+isnot(principal, undefined, "Should have a principal");
+isnot(principal, null, "Should have a non-null principal");
+is(principal.isSystemPrincipal, false,
+   "Shouldn't have system principal here");
+try {
+  secMan.checkLoadURIWithPrincipal(principal, null,
+                                   nsIScriptSecurityManager.STANDARD);
+} catch (e) {
+  // throwing is fine, it's just crashing that's bad
+}
+ok(true, "Survival: we should get here without crashing");
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/mochitest/test_bug995943.xhtml b/caps/tests/mochitest/test_bug995943.xhtml
new file mode 100644
index 0000000000..0ba95f548d
--- /dev/null
+++ b/caps/tests/mochitest/test_bug995943.xhtml
@@ -0,0 +1,111 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=995943
+-->
+<window title="Mozilla Bug 995943"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=995943"
+     target="_blank">Mozilla Bug 995943</a>
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  <![CDATA[
+  function debug(msg) { info(msg); }
+
+  /** Test for CAPS file:// URI prefs. */
+  SimpleTest.waitForExplicitFinish();
+  SimpleTest.requestCompleteLog();
+  if (navigator.userAgent.includes("Mac OS X 10.10"))
+    SimpleTest.expectAssertions(5, 11); // See bug 1067022, 1307988
+  else if (Services.appinfo.OS == "WINNT")
+    SimpleTest.expectAssertions(0, 1); // See bug 1067022
+  else
+    SimpleTest.expectAssertions(0, 9); // See bug 1305241, 1145314
+
+  var rootdir = Services.appinfo.OS == "WINNT" ? "file:///C:" : "file:///";
+
+  function checkLoadFileURI(domain, shouldLoad) {
+    debug("Invoking checkLoadFileURI with domain: " + domain + ", shouldLoad: " + shouldLoad);
+    return new Promise(function(resolve, reject) {
+      $('ifr').addEventListener('load', function l1() {
+        debug("Invoked l1 for " + domain);
+        $('ifr').removeEventListener('load', l1);
+        function l2() {
+          debug("Invoked l2 for " + domain);
+          $('ifr').removeEventListener('load', l2);
+          ok(shouldLoad, "Successfully loaded file:// URI for domain: " + domain);
+          resolve();
+        }
+        $('ifr').addEventListener('load', l2);
+        try {
+          window[0].wrappedJSObject.location = rootdir;
+          debug("Successfully navigated for " + domain);
+        } catch (e) {
+          ok(!shouldLoad && /denied|insecure/.test(e),
+             "Prevented loading of file:// URI for domain: " + domain + " - " + e);
+          $('ifr').removeEventListener('load', l2);
+          resolve();
+        }
+      });
+      let targetURI = domain + '/tests/js/xpconnect/tests/mochitest/file_empty.html';
+      debug("Navigating iframe to " + targetURI);
+      $('ifr').contentWindow.location = targetURI;
+    });
+  }
+
+  function pushPrefs(prefs) {
+    return SpecialPowers.pushPrefEnv({ set: prefs });
+  }
+
+  function popPrefs() {
+    return new Promise(function(resolve) { SpecialPowers.popPrefEnv(resolve); });
+  }
+
+  var gGoCount = 0;
+  function go() {
+    debug("Invoking go for window with id: " + window.windowGlobalChild.innerWindowId);
+    is(++gGoCount, 1, "Should only call go once!");
+    checkLoadFileURI('http://example.com', false).then(
+      pushPrefs.bind(null, [['capability.policy.policynames', ' somepolicy '],
+                            ['capability.policy.somepolicy.checkloaduri.enabled', 'AlLAcCeSs'],
+                            ['capability.policy.somepolicy.sites', 'http://example.com']]))
+    .then(checkLoadFileURI.bind(null, 'http://example.com', true))
+    .then(popPrefs)
+    .then(checkLoadFileURI.bind(null, 'http://example.com', false))
+    .then(
+      pushPrefs.bind(null, [['capability.policy.policynames', ',somepolicy, someotherpolicy, '],
+                            ['capability.policy.somepolicy.checkloaduri.enabled', 'allaccess'],
+                            ['capability.policy.someotherpolicy.checkloaduri.enabled', 'nope'],
+                            ['capability.policy.somepolicy.sites', ' http://example.org   test1.example.com https://test2.example.com '],
+                            ['capability.policy.someotherpolicy.sites', 'http://example.net ']]))
+    .then(checkLoadFileURI.bind(null, 'http://example.org', true))
+    .then(checkLoadFileURI.bind(null, 'http://test2.example.com', false))
+    .then(checkLoadFileURI.bind(null, 'https://test2.example.com', true))
+    .then(checkLoadFileURI.bind(null, 'http://sub1.test2.example.com', false))
+    .then(checkLoadFileURI.bind(null, 'https://sub1.test2.example.com', true))
+    .then(checkLoadFileURI.bind(null, 'http://example.net', false))
+    .then(checkLoadFileURI.bind(null, 'http://test1.example.com', true))
+    .then(checkLoadFileURI.bind(null, 'https://test1.example.com', true))
+    .then(checkLoadFileURI.bind(null, 'http://sub1.test1.example.com', true))
+    .then(checkLoadFileURI.bind(null, 'https://sub1.test1.example.com', true))
+    .then(pushPrefs.bind(null, [['capability.policy.someotherpolicy.checkloaduri.enabled', 'allAccess']]))
+    .then(checkLoadFileURI.bind(null, 'http://example.net', true))
+    .then(popPrefs)
+    .then(popPrefs)
+    .then(checkLoadFileURI.bind(null, 'http://example.net', false))
+    .then(SimpleTest.finish.bind(SimpleTest));
+
+  }
+  addLoadEvent(go);
+
+  ]]>
+  </script>
+  <iframe id="ifr" type="content" />
+</window>
diff --git a/caps/tests/mochitest/test_disableScript.xhtml b/caps/tests/mochitest/test_disableScript.xhtml
new file mode 100644
index 0000000000..8c16c13bc3
--- /dev/null
+++ b/caps/tests/mochitest/test_disableScript.xhtml
@@ -0,0 +1,330 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=840488
+-->
+<window title="Mozilla Bug 840488"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=840488"
+     target="_blank">Mozilla Bug 840488</a>
+  </body>
+
+  <iframe id="root" name="root" type="content"/>
+  <iframe id="chromeFrame" name="chromeFrame" type="content"/>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  /* eslint-disable mozilla/no-useless-parameters, no-redeclare, no-undef */
+  <![CDATA[
+
+  /** Test for all the different ways that script can be disabled for a given global. */
+
+  SimpleTest.waitForExplicitFinish();
+  const ssm = Services.scriptSecurityManager;
+  function makeURI(uri) { return Services.io.newURI(uri); }
+  const path = "/tests/caps/tests/mochitest/file_disableScript.html";
+  const uri = "http://www.example.com" + path;
+  var rootFrame = document.getElementById('root');
+  var chromeFrame = document.getElementById('chromeFrame');
+  navigateFrame(rootFrame, uri + "?name=rootframe").then(function() {
+    navigateFrame(chromeFrame, "file_disableScript.html").then(go);
+  });
+
+  function navigateFrame(ifr, src) {
+    return new Promise(resolve => {
+      function onload() {
+        ifr.removeEventListener('load', onload);
+        resolve();
+      }
+      ifr.addEventListener('load', onload, false);
+      ifr.setAttribute('src', src);
+    });
+  }
+
+  function navigateBack(ifr) {
+    return new Promise(resolve => {
+
+      // pageshow events don't fire on the iframe element, so we need to use the
+      // chrome event handler for the docshell.
+      var browser = ifr.contentWindow.docShell.chromeEventHandler;
+      function onpageshow(evt) {
+        info("Navigated back. Persisted: " + evt.persisted);
+        browser.removeEventListener('pageshow', onpageshow);
+        resolve();
+      }
+      browser.addEventListener('pageshow', onpageshow, false);
+      ifr.contentWindow.history.back();
+    });
+  }
+
+  function addFrame(parentWin, name, expectOnload) {
+    let ifr = parentWin.document.createElement('iframe');
+    parentWin.document.body.appendChild(ifr);
+    ifr.setAttribute('name', name);
+    return new Promise(resolve => {
+      // We need to append 'name' to avoid running afoul of recursive frame detection.
+      let frameURI = uri + "?name=" + name;
+      navigateFrame(ifr, frameURI).then(function() {
+        is(String(ifr.contentWindow.location), frameURI, "Successful load");
+        is(!!ifr.contentWindow.wrappedJSObject.gFiredOnload, expectOnload,
+           "onload should only fire when scripts are enabled");
+        resolve();
+      });
+    });
+  }
+
+  function checkScriptEnabled(win, expectEnabled) {
+    win.wrappedJSObject.gFiredOnclick = false;
+    win.document.body.dispatchEvent(new win.Event('click'));
+    is(win.wrappedJSObject.gFiredOnclick, expectEnabled, "Checking script-enabled for " + win.name + " (" + win.location + ")");
+  }
+
+  function setScriptEnabled(win, enabled) {
+    win.browsingContext.allowJavascript = enabled;
+  }
+
+  function testList(expectEnabled, win, list, idx) {
+    idx = idx || 0;
+    return new Promise(resolve => {
+      let target = list[idx] + path;
+      info("Testing scriptability for: " + target + ". expecting " + expectEnabled);
+      navigateFrame(win.frameElement, target).then(function() {
+        checkScriptEnabled(win, expectEnabled);
+        if (idx == list.length - 1)
+          resolve();
+        else
+        testList(expectEnabled, win, list, idx + 1).then(function() { resolve(); });
+      });
+    });
+  }
+
+  function testDomainPolicy(defaultScriptability, exceptions, superExceptions,
+                            exempt, notExempt, set, superSet, win) {
+    // Populate our sets.
+    for (var e of exceptions)
+      set.add(makeURI(e));
+    for (var e of superExceptions)
+      superSet.add(makeURI(e));
+
+    return testList(defaultScriptability, win, notExempt).then(function() {
+      return testList(!defaultScriptability, win, exempt);
+    });
+  }
+
+  function setScriptEnabledForBrowser(enabled) {
+    var prefname = "javascript.enabled";
+    Services.prefs.setBoolPref(prefname, enabled);
+  }
+
+  function reloadFrame(frame) {
+    return new Promise(resolve => {
+      frame.addEventListener('load', function onload() {
+        resolve();
+        frame.removeEventListener('load', onload);
+      }, false);
+      frame.contentWindow.location.reload(true);
+    });
+  }
+
+  function go() {
+    var rootWin = rootFrame.contentWindow;
+    var chromeWin = chromeFrame.contentWindow;
+
+    // Test simple docshell enable/disable.
+    checkScriptEnabled(rootWin, true);
+    setScriptEnabled(rootWin, false);
+    checkScriptEnabled(rootWin, false);
+    setScriptEnabled(rootWin, true);
+    checkScriptEnabled(rootWin, true);
+
+    // Privileged frames are immune to docshell flags.
+    ok(chromeWin.document.nodePrincipal.isSystemPrincipal, "Sanity check for System Principal");
+    setScriptEnabled(chromeWin, false);
+    checkScriptEnabled(chromeWin, true);
+    setScriptEnabled(chromeWin, true);
+
+    // Play around with the docshell tree and make sure everything works as
+    // we expect.
+    addFrame(rootWin, 'parent', true).then(function() {
+      checkScriptEnabled(rootWin[0], true);
+      return addFrame(rootWin[0], 'childA', true);
+    }).then(function() {
+      checkScriptEnabled(rootWin[0][0], true);
+      setScriptEnabled(rootWin[0], false);
+      checkScriptEnabled(rootWin, true);
+      checkScriptEnabled(rootWin[0], false);
+      checkScriptEnabled(rootWin[0][0], false);
+      return addFrame(rootWin[0], 'childB', false);
+    }).then(function() {
+      checkScriptEnabled(rootWin[0][1], false);
+      setScriptEnabled(rootWin[0][0], false);
+      setScriptEnabled(rootWin[0], true);
+      checkScriptEnabled(rootWin[0], true);
+      checkScriptEnabled(rootWin[0][0], false);
+      setScriptEnabled(rootWin[0][0], true);
+
+      // Flags are inherited from the parent docshell at attach time. Note that
+      // the flag itself is inherited, regardless of whether or not scripts are
+      // currently allowed on the parent (which could depend on the parent's
+      // parent). Check that.
+      checkScriptEnabled(rootWin[0][1], false);
+      setScriptEnabled(rootWin[0], false);
+      setScriptEnabled(rootWin[0][1], true);
+      return addFrame(rootWin[0][1], 'grandchild', false);
+    }).then(function() {
+      checkScriptEnabled(rootWin[0], false);
+      checkScriptEnabled(rootWin[0][1], false);
+      checkScriptEnabled(rootWin[0][1][0], false);
+      setScriptEnabled(rootWin[0], true);
+      checkScriptEnabled(rootWin[0], true);
+      checkScriptEnabled(rootWin[0][1], true);
+      checkScriptEnabled(rootWin[0][1][0], true);
+
+    // Try navigating two frames, then munging docshell scriptability, then
+    // pulling the frames out of the bfcache to make sure that flags are
+    // properly propagated to inactive inner windows. We do this both for an
+    // 'own' docshell, as well as for an ancestor docshell.
+      return navigateFrame(rootWin[0][0].frameElement, rootWin[0][0].location + '-navigated');
+    }).then(function() { return navigateFrame(rootWin[0][1][0].frameElement, rootWin[0][1][0].location + '-navigated'); })
+      .then(function() {
+      checkScriptEnabled(rootWin[0][0], true);
+      checkScriptEnabled(rootWin[0][1][0], true);
+      setScriptEnabled(rootWin[0][0], false);
+      setScriptEnabled(rootWin[0][1], false);
+      checkScriptEnabled(rootWin[0][0], false);
+      checkScriptEnabled(rootWin[0][1][0], false);
+      return navigateBack(rootWin[0][0].frameElement);
+    }).then(function() { return navigateBack(rootWin[0][1][0].frameElement); })
+      .then(function() {
+      checkScriptEnabled(rootWin[0][0], false);
+      checkScriptEnabled(rootWin[0][1][0], false);
+
+    // Disable JS via the global pref pref. This is only guaranteed to have an effect
+    // for subsequent loads.
+      setScriptEnabledForBrowser(false);
+      return reloadFrame(rootFrame);
+    }).then(function() {
+      checkScriptEnabled(rootWin, false);
+      checkScriptEnabled(chromeWin, true);
+      setScriptEnabledForBrowser(true);
+      return reloadFrame(rootFrame);
+    }).then(function() {
+      checkScriptEnabled(rootWin, true);
+
+    // Play around with dynamically blocking script for a given global.
+    // This takes effect immediately.
+      Cu.blockScriptForGlobal(rootWin);
+      Cu.blockScriptForGlobal(rootWin);
+      Cu.unblockScriptForGlobal(rootWin);
+      checkScriptEnabled(rootWin, false);
+      Cu.unblockScriptForGlobal(rootWin);
+      checkScriptEnabled(rootWin, true);
+      Cu.blockScriptForGlobal(rootWin);
+      try {
+        Cu.blockScriptForGlobal(chromeWin);
+        ok(false, "Should have thrown");
+      } catch (e) {
+        ok(/may not be disabled/.test(e),
+           "Shouldn't be able to programmatically block script for system globals");
+      }
+      return reloadFrame(rootFrame);
+    }).then(function() {
+      checkScriptEnabled(rootWin, true);
+
+    // Test system-wide domain policy. This only takes effect for subsequently-
+    // loaded globals.
+
+    // Check the basic semantics of the sets.
+    is(ssm.domainPolicyActive, false, "not enabled");
+    window.policy = ssm.activateDomainPolicy();
+    ok(policy instanceof Ci.nsIDomainPolicy, "Got a policy");
+    try {
+      ssm.activateDomainPolicy();
+      ok(false, "Should have thrown");
+    } catch (e) {
+      ok(true, "can't have two live domain policies");
+    }
+    var sbRef = policy.superBlocklist;
+    isnot(sbRef, null, "superBlocklist non-null");
+    ok(!sbRef.contains(makeURI('http://www.example.com')));
+    sbRef.add(makeURI('http://www.example.com/foopy'));
+    ok(sbRef.contains(makeURI('http://www.example.com')));
+    sbRef.remove(makeURI('http://www.example.com'));
+    ok(!sbRef.contains(makeURI('http://www.example.com')));
+    sbRef.add(makeURI('http://www.example.com/foopy/this.that/'));
+    ok(sbRef.contains(makeURI('http://www.example.com/baz')));
+    ok(!sbRef.contains(makeURI('https://www.example.com')));
+    ok(!sbRef.contains(makeURI('https://www.example.com:88')));
+    ok(!sbRef.contains(makeURI('http://foo.www.example.com')));
+    ok(sbRef.containsSuperDomain(makeURI('http://foo.www.example.com')));
+    ok(sbRef.containsSuperDomain(makeURI('http://foo.bar.www.example.com')));
+    ok(!sbRef.containsSuperDomain(makeURI('http://foo.bar.www.exxample.com')));
+    ok(!sbRef.containsSuperDomain(makeURI('http://example.com')));
+    ok(!sbRef.containsSuperDomain(makeURI('http://com/this.that/')));
+    ok(!sbRef.containsSuperDomain(makeURI('https://foo.www.example.com')));
+    ok(sbRef.contains(makeURI('http://www.example.com')));
+    policy.deactivate();
+    is(ssm.domainPolicyActive, false, "back to inactive");
+    ok(!sbRef.contains(makeURI('http://www.example.com')),
+       "Disabling domain policy clears the set");
+    policy = ssm.activateDomainPolicy();
+    ok(policy.superBlocklist);
+    isnot(sbRef, policy.superBlocklist, "Mint new sets each time!");
+    policy.deactivate();
+    is(policy.blocklist, null, "blocklist nulled out");
+    policy = ssm.activateDomainPolicy();
+    isnot(policy.blocklist, null, "non-null again");
+    isnot(policy.blocklist, sbRef, "freshly minted");
+    policy.deactivate();
+
+    //
+    // Now, create and apply a mock-policy. We check the same policy both as
+    // a blocklist and as a allowlist.
+    //
+
+    window.testPolicy = {
+      // The policy.
+      exceptions: ['http://test1.example.com', 'http://example.com'],
+      superExceptions: ['http://test2.example.org', 'https://test1.example.com'],
+
+      // The testcases.
+      exempt: ['http://test1.example.com', 'http://example.com',
+               'http://test2.example.org', 'http://sub1.test2.example.org',
+               'https://sub1.test1.example.com'],
+
+      notExempt: ['http://test2.example.com', 'http://sub1.test1.example.com',
+                  'http://www.example.com', 'https://test2.example.com',
+                  'https://example.com', 'http://test1.example.org'],
+    };
+
+    policy = ssm.activateDomainPolicy();
+    info("Testing Blocklist-style Domain Policy");
+    return testDomainPolicy(true, testPolicy.exceptions,
+                            testPolicy.superExceptions, testPolicy.exempt,
+                            testPolicy.notExempt, policy.blocklist,
+                            policy.superBlocklist, rootWin);
+  }).then(function() {
+    policy.deactivate();
+    policy = ssm.activateDomainPolicy();
+    info("Testing Allowlist-style Domain Policy");
+    setScriptEnabledForBrowser(false);
+    return testDomainPolicy(false, testPolicy.exceptions,
+                            testPolicy.superExceptions, testPolicy.exempt,
+                            testPolicy.notExempt, policy.allowlist,
+                            policy.superAllowlist, rootWin);
+  }).then(function() {
+    setScriptEnabledForBrowser(true);
+    policy.deactivate();
+
+    SimpleTest.finish();
+    });
+  }
+
+  ]]>
+  </script>
+</window>
diff --git a/caps/tests/mochitest/test_disallowInheritPrincipal.html b/caps/tests/mochitest/test_disallowInheritPrincipal.html
new file mode 100644
index 0000000000..308ee61320
--- /dev/null
+++ b/caps/tests/mochitest/test_disallowInheritPrincipal.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=732413
+-->
+<head>
+  <title>Test for Bug 732413</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=732413">Mozilla Bug 732413</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 732413
+    Passing DISALLOW_INHERIT_PRINCIPAL flag should be effective even if
+    aPrincipal is the system principal.
+ */
+
+const nsIScriptSecurityManager = SpecialPowers.Ci.nsIScriptSecurityManager;
+var secMan = SpecialPowers.Cc["@mozilla.org/scriptsecuritymanager;1"]
+                       .getService(nsIScriptSecurityManager);
+var sysPrincipal = secMan.getSystemPrincipal();
+isnot(sysPrincipal, undefined, "Should have a principal");
+isnot(sysPrincipal, null, "Should have a non-null principal");
+is(sysPrincipal.isSystemPrincipal, true,
+   "Should have system principal here");
+
+
+var inheritingURI = SpecialPowers.Services.io.newURI("javascript:1+1");
+
+// First try a normal call to checkLoadURIWithPrincipal
+try {
+  secMan.checkLoadURIWithPrincipal(sysPrincipal, inheritingURI,
+                                   nsIScriptSecurityManager.STANDARD);
+  ok(true, "checkLoadURI allowed the load");
+} catch (e) {
+  ok(false, "checkLoadURI failed unexpectedly: " + e);
+}
+
+// Now call checkLoadURIWithPrincipal with DISALLOW_INHERIT_PRINCIPAL
+try {
+  secMan.checkLoadURIWithPrincipal(sysPrincipal, inheritingURI,
+                                   nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
+  ok(false, "checkLoadURI allowed the load unexpectedly");
+} catch (e) {
+  ok(true, "checkLoadURI prevented load of principal-inheriting URI");
+}
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/caps/tests/unit/test_ipv6_host_literal.js b/caps/tests/unit/test_ipv6_host_literal.js
new file mode 100644
index 0000000000..cde7d82d7e
--- /dev/null
+++ b/caps/tests/unit/test_ipv6_host_literal.js
@@ -0,0 +1,38 @@
+var ssm = Services.scriptSecurityManager;
+function makeURI(uri) {
+  return Services.io.newURI(uri);
+}
+
+function testIPV6Host(aHost, aExpected) {
+  var ipv6Host = ssm.createContentPrincipal(makeURI(aHost), {});
+  Assert.equal(ipv6Host.origin, aExpected);
+}
+
+function run_test() {
+  testIPV6Host("http://[::1]/", "http://[::1]");
+
+  testIPV6Host(
+    "http://[2001:db8:85a3:8d3:1319:8a2e:370:7348]/",
+    "http://[2001:db8:85a3:8d3:1319:8a2e:370:7348]"
+  );
+
+  testIPV6Host(
+    "http://[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443/",
+    "http://[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443"
+  );
+
+  testIPV6Host(
+    "http://[2001:db8:85a3::1319:8a2e:370:7348]/",
+    "http://[2001:db8:85a3:0:1319:8a2e:370:7348]"
+  );
+
+  testIPV6Host(
+    "http://[20D1:0000:3238:DFE1:63:0000:0000:FEFB]/",
+    "http://[20d1:0:3238:dfe1:63::fefb]"
+  );
+
+  testIPV6Host(
+    "http://[20D1:0:3238:DFE1:63::FEFB]/",
+    "http://[20d1:0:3238:dfe1:63::fefb]"
+  );
+}
diff --git a/caps/tests/unit/test_oa_partitionKey_pattern.js b/caps/tests/unit/test_oa_partitionKey_pattern.js
new file mode 100644
index 0000000000..5d0625018f
--- /dev/null
+++ b/caps/tests/unit/test_oa_partitionKey_pattern.js
@@ -0,0 +1,159 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests origin attributes partitionKey pattern matching.
+ */
+
+"use strict";
+
+function testMatch(oa, pattern, shouldMatch = true) {
+  let msg = `Origin attributes should ${
+    shouldMatch ? "match" : "not match"
+  } pattern.`;
+  msg += ` oa: ${JSON.stringify(oa)} - pattern: ${JSON.stringify(pattern)}`;
+  Assert.equal(
+    ChromeUtils.originAttributesMatchPattern(oa, pattern),
+    shouldMatch,
+    msg
+  );
+}
+
+function getPartitionKey(scheme, baseDomain, port) {
+  if (!scheme || !baseDomain) {
+    return "";
+  }
+  return `(${scheme},${baseDomain}${port ? `,${port}` : ``})`;
+}
+
+function getOAWithPartitionKey(scheme, baseDomain, port, oa = {}) {
+  oa.partitionKey = getPartitionKey(scheme, baseDomain, port);
+  return oa;
+}
+
+/**
+ * Tests that an OriginAttributesPattern which is empty or only has an empty
+ * partitionKeyPattern matches any partitionKey.
+ */
+add_task(async function test_empty_pattern_matches_any() {
+  let list = [
+    getOAWithPartitionKey("https", "example.com"),
+    getOAWithPartitionKey("http", "example.net", 8080),
+    getOAWithPartitionKey(),
+  ];
+
+  for (let oa of list) {
+    testMatch(oa, {});
+    testMatch(oa, { partitionKeyPattern: {} });
+  }
+});
+
+/**
+ * Tests that if a partitionKeyPattern is passed, but the partitionKey is
+ * invalid, the pattern match will always fail.
+ */
+add_task(async function test_invalid_pk() {
+  let list = [
+    "()",
+    "(,,)",
+    "(https)",
+    "(https,,)",
+    "(example.com)",
+    "(http,example.com,invalid)",
+    "(http,example.com,8000,1000)",
+  ].map(partitionKey => ({ partitionKey }));
+
+  for (let oa of list) {
+    testMatch(oa, {});
+    testMatch(oa, { partitionKeyPattern: {} });
+    testMatch(
+      oa,
+      { partitionKeyPattern: { baseDomain: "example.com" } },
+      false
+    );
+    testMatch(oa, { partitionKeyPattern: { scheme: "https" } }, false);
+  }
+});
+
+/**
+ * Tests that if a pattern sets "partitionKey" it takes precedence over "partitionKeyPattern".
+ */
+add_task(async function test_string_overwrites_pattern() {
+  let oa = getOAWithPartitionKey("https", "example.com", 8080, {
+    userContextId: 2,
+  });
+
+  testMatch(oa, { partitionKey: oa.partitionKey });
+  testMatch(oa, {
+    partitionKey: oa.partitionKey,
+    partitionKeyPattern: { baseDomain: "example.com" },
+  });
+  testMatch(oa, {
+    partitionKey: oa.partitionKey,
+    partitionKeyPattern: { baseDomain: "example.net" },
+  });
+  testMatch(
+    oa,
+    {
+      partitionKey: getPartitionKey("https", "example.net"),
+      partitionKeyPattern: { scheme: "https", baseDomain: "example.com" },
+    },
+    false
+  );
+});
+
+/**
+ * Tests that we can match parts of a partitionKey by setting
+ * partitionKeyPattern.
+ */
+add_task(async function test_pattern() {
+  let a = getOAWithPartitionKey("https", "example.com", 8080, {
+    userContextId: 2,
+  });
+  let b = getOAWithPartitionKey("https", "example.com", undefined, {
+    privateBrowsingId: 1,
+  });
+
+  for (let oa of [a, b]) {
+    // Match
+    testMatch(oa, { partitionKeyPattern: { scheme: "https" } });
+    testMatch(oa, {
+      partitionKeyPattern: { scheme: "https", baseDomain: "example.com" },
+    });
+    testMatch(
+      oa,
+      {
+        partitionKeyPattern: {
+          scheme: "https",
+          baseDomain: "example.com",
+          port: 8080,
+        },
+      },
+      oa == a
+    );
+    testMatch(oa, {
+      partitionKeyPattern: { baseDomain: "example.com" },
+    });
+    testMatch(
+      oa,
+      {
+        partitionKeyPattern: { port: 8080 },
+      },
+      oa == a
+    );
+
+    // Mismatch
+    testMatch(oa, { partitionKeyPattern: { scheme: "http" } }, false);
+    testMatch(
+      oa,
+      { partitionKeyPattern: { baseDomain: "example.net" } },
+      false
+    );
+    testMatch(oa, { partitionKeyPattern: { port: 8443 } }, false);
+    testMatch(
+      oa,
+      { partitionKeyPattern: { scheme: "https", baseDomain: "example.net" } },
+      false
+    );
+  }
+});
diff --git a/caps/tests/unit/test_origin.js b/caps/tests/unit/test_origin.js
new file mode 100644
index 0000000000..c0cbc2996a
--- /dev/null
+++ b/caps/tests/unit/test_origin.js
@@ -0,0 +1,323 @@
+var ssm = Services.scriptSecurityManager;
+function makeURI(uri) {
+  return Services.io.newURI(uri);
+}
+
+function checkThrows(f) {
+  var threw = false;
+  try {
+    f();
+  } catch (e) {
+    threw = true;
+  }
+  Assert.ok(threw);
+}
+
+function checkCrossOrigin(a, b) {
+  Assert.ok(!a.equals(b));
+  Assert.ok(!a.equalsConsideringDomain(b));
+  Assert.ok(!a.subsumes(b));
+  Assert.ok(!a.subsumesConsideringDomain(b));
+  Assert.ok(!b.subsumes(a));
+  Assert.ok(!b.subsumesConsideringDomain(a));
+}
+
+function checkOriginAttributes(prin, attrs, suffix) {
+  attrs = attrs || {};
+  Assert.equal(
+    prin.originAttributes.inIsolatedMozBrowser,
+    attrs.inIsolatedMozBrowser || false
+  );
+  Assert.equal(prin.originSuffix, suffix || "");
+  Assert.equal(ChromeUtils.originAttributesToSuffix(attrs), suffix || "");
+  Assert.ok(
+    ChromeUtils.originAttributesMatchPattern(prin.originAttributes, attrs)
+  );
+  if (!prin.isNullPrincipal && !prin.origin.startsWith("[")) {
+    Assert.ok(ssm.createContentPrincipalFromOrigin(prin.origin).equals(prin));
+  } else {
+    checkThrows(() => ssm.createContentPrincipalFromOrigin(prin.origin));
+  }
+}
+
+function checkSandboxOriginAttributes(arr, attrs, options) {
+  options = options || {};
+  var sandbox = Cu.Sandbox(arr, options);
+  checkOriginAttributes(
+    Cu.getObjectPrincipal(sandbox),
+    attrs,
+    ChromeUtils.originAttributesToSuffix(attrs)
+  );
+}
+
+// utility function useful for debugging
+// eslint-disable-next-line no-unused-vars
+function printAttrs(name, attrs) {
+  info(
+    name +
+      " {\n" +
+      "\tuserContextId: " +
+      attrs.userContextId +
+      ",\n" +
+      "\tinIsolatedMozBrowser: " +
+      attrs.inIsolatedMozBrowser +
+      ",\n" +
+      "\tprivateBrowsingId: '" +
+      attrs.privateBrowsingId +
+      "',\n" +
+      "\tfirstPartyDomain: '" +
+      attrs.firstPartyDomain +
+      "'\n}"
+  );
+}
+
+function checkValues(attrs, values) {
+  values = values || {};
+  // printAttrs("attrs", attrs);
+  // printAttrs("values", values);
+  Assert.equal(attrs.userContextId, values.userContextId || 0);
+  Assert.equal(
+    attrs.inIsolatedMozBrowser,
+    values.inIsolatedMozBrowser || false
+  );
+  Assert.equal(attrs.privateBrowsingId, values.privateBrowsingId || "");
+  Assert.equal(attrs.firstPartyDomain, values.firstPartyDomain || "");
+}
+
+function run_test() {
+  // Attributeless origins.
+  Assert.equal(ssm.getSystemPrincipal().origin, "[System Principal]");
+  checkOriginAttributes(ssm.getSystemPrincipal());
+  var exampleOrg = ssm.createContentPrincipal(
+    makeURI("http://example.org"),
+    {}
+  );
+  Assert.equal(exampleOrg.origin, "http://example.org");
+  checkOriginAttributes(exampleOrg);
+  var exampleCom = ssm.createContentPrincipal(
+    makeURI("https://www.example.com:123"),
+    {}
+  );
+  Assert.equal(exampleCom.origin, "https://www.example.com:123");
+  checkOriginAttributes(exampleCom);
+  var nullPrin = Cu.getObjectPrincipal(new Cu.Sandbox(null));
+  Assert.ok(
+    /^moz-nullprincipal:\{([0-9]|[a-z]|\-){36}\}$/.test(nullPrin.origin)
+  );
+  checkOriginAttributes(nullPrin);
+  var ipv6Prin = ssm.createContentPrincipal(
+    makeURI("https://[2001:db8::ff00:42:8329]:123"),
+    {}
+  );
+  Assert.equal(ipv6Prin.origin, "https://[2001:db8::ff00:42:8329]:123");
+  checkOriginAttributes(ipv6Prin);
+  var ipv6NPPrin = ssm.createContentPrincipal(
+    makeURI("https://[2001:db8::ff00:42:8329]"),
+    {}
+  );
+  Assert.equal(ipv6NPPrin.origin, "https://[2001:db8::ff00:42:8329]");
+  checkOriginAttributes(ipv6NPPrin);
+  var ep = Cu.getObjectPrincipal(
+    Cu.Sandbox([exampleCom, nullPrin, exampleOrg])
+  );
+  checkOriginAttributes(ep);
+  checkCrossOrigin(exampleCom, exampleOrg);
+  checkCrossOrigin(exampleOrg, nullPrin);
+
+  // nsEP origins should be in lexical order.
+  Assert.equal(
+    ep.origin,
+    `[Expanded Principal [${exampleCom.origin}, ${nullPrin.origin}, ${exampleOrg.origin}]]`
+  );
+
+  // Make sure createContentPrincipal does what the rest of gecko does.
+  Assert.ok(
+    exampleOrg.equals(
+      Cu.getObjectPrincipal(new Cu.Sandbox("http://example.org"))
+    )
+  );
+
+  //
+  // Test origin attributes.
+  //
+
+  // Just browser.
+  var exampleOrg_browser = ssm.createContentPrincipal(
+    makeURI("http://example.org"),
+    { inIsolatedMozBrowser: true }
+  );
+  var nullPrin_browser = ssm.createNullPrincipal({
+    inIsolatedMozBrowser: true,
+  });
+  checkOriginAttributes(
+    exampleOrg_browser,
+    { inIsolatedMozBrowser: true },
+    "^inBrowser=1"
+  );
+  checkOriginAttributes(
+    nullPrin_browser,
+    { inIsolatedMozBrowser: true },
+    "^inBrowser=1"
+  );
+  Assert.equal(exampleOrg_browser.origin, "http://example.org^inBrowser=1");
+
+  // First party Uri
+  var exampleOrg_firstPartyDomain = ssm.createContentPrincipal(
+    makeURI("http://example.org"),
+    { firstPartyDomain: "example.org" }
+  );
+  checkOriginAttributes(
+    exampleOrg_firstPartyDomain,
+    { firstPartyDomain: "example.org" },
+    "^firstPartyDomain=example.org"
+  );
+  Assert.equal(
+    exampleOrg_firstPartyDomain.origin,
+    "http://example.org^firstPartyDomain=example.org"
+  );
+
+  // Just userContext.
+  var exampleOrg_userContext = ssm.createContentPrincipal(
+    makeURI("http://example.org"),
+    { userContextId: 42 }
+  );
+  checkOriginAttributes(
+    exampleOrg_userContext,
+    { userContextId: 42 },
+    "^userContextId=42"
+  );
+  Assert.equal(
+    exampleOrg_userContext.origin,
+    "http://example.org^userContextId=42"
+  );
+
+  checkSandboxOriginAttributes(null, {});
+  checkSandboxOriginAttributes("http://example.org", {});
+  checkSandboxOriginAttributes(
+    "http://example.org",
+    {},
+    { originAttributes: {} }
+  );
+  checkSandboxOriginAttributes(["http://example.org"], {});
+  checkSandboxOriginAttributes(
+    ["http://example.org"],
+    {},
+    { originAttributes: {} }
+  );
+
+  // Check that all of the above are cross-origin.
+  checkCrossOrigin(exampleOrg_browser, nullPrin_browser);
+  checkCrossOrigin(exampleOrg_firstPartyDomain, exampleOrg);
+  checkCrossOrigin(exampleOrg_userContext, exampleOrg);
+
+  // Check Principal kinds.
+  function checkKind(prin, kind) {
+    Assert.equal(prin.isNullPrincipal, kind == "nullPrincipal");
+    Assert.equal(prin.isContentPrincipal, kind == "contentPrincipal");
+    Assert.equal(prin.isExpandedPrincipal, kind == "expandedPrincipal");
+    Assert.equal(prin.isSystemPrincipal, kind == "systemPrincipal");
+  }
+  checkKind(ssm.createNullPrincipal({}), "nullPrincipal");
+  checkKind(
+    ssm.createContentPrincipal(makeURI("http://www.example.com"), {}),
+    "contentPrincipal"
+  );
+  checkKind(
+    Cu.getObjectPrincipal(
+      Cu.Sandbox([
+        ssm.createContentPrincipal(makeURI("http://www.example.com"), {}),
+      ])
+    ),
+    "expandedPrincipal"
+  );
+  checkKind(ssm.getSystemPrincipal(), "systemPrincipal");
+
+  //
+  // Test Origin Attribute Manipulation
+  //
+
+  // check that we can create an empty origin attributes dict with default
+  // members and values.
+  var emptyAttrs = ChromeUtils.fillNonDefaultOriginAttributes({});
+  checkValues(emptyAttrs);
+
+  var uri = "http://example.org";
+  var tests = [
+    ["", {}],
+    ["^userContextId=3", { userContextId: 3 }],
+    ["^inBrowser=1", { inIsolatedMozBrowser: true }],
+    ["^firstPartyDomain=example.org", { firstPartyDomain: "example.org" }],
+  ];
+
+  // check that we can create an origin attributes from an origin properly
+  tests.forEach(t => {
+    let attrs = ChromeUtils.createOriginAttributesFromOrigin(uri + t[0]);
+    checkValues(attrs, t[1]);
+    Assert.equal(ChromeUtils.originAttributesToSuffix(attrs), t[0]);
+  });
+
+  // check that we can create an origin attributes from a dict properly
+  tests.forEach(t => {
+    let attrs = ChromeUtils.fillNonDefaultOriginAttributes(t[1]);
+    checkValues(attrs, t[1]);
+    Assert.equal(ChromeUtils.originAttributesToSuffix(attrs), t[0]);
+  });
+
+  // each row in the dflt_tests array has these values:
+  // [0] - the suffix used to create an origin attribute from
+  // [1] - the expected result of creating an origin attributes from [0]
+  // [2] - the expected result after setting userContextId to the default
+  // [3] - the expected result of creating a suffix from [2]
+  var dflt_tests = [
+    ["", {}, {}, ""],
+    ["^userContextId=3", { userContextId: 3 }, {}, ""],
+  ];
+
+  // check that we can set the userContextId to default properly
+  dflt_tests.forEach(t => {
+    let orig = ChromeUtils.createOriginAttributesFromOrigin(uri + t[0]);
+    checkValues(orig, t[1]);
+    let mod = orig;
+    mod.userContextId = 0;
+    checkValues(mod, t[2]);
+    Assert.equal(ChromeUtils.originAttributesToSuffix(mod), t[3]);
+  });
+
+  // each row in the dflt2_tests array has these values:
+  // [0] - the suffix used to create an origin attribute from
+  // [1] - the expected result of creating an origin attributes from [0]
+  // [2] - the expected result after setting firstPartyUri to the default
+  // [3] - the expected result of creating a suffix from [2]
+  var dflt2_tests = [
+    ["", {}, {}, ""],
+    ["^firstPartyDomain=foo.com", { firstPartyDomain: "foo.com" }, {}, ""],
+  ];
+
+  // check that we can set the userContextId to default properly
+  dflt2_tests.forEach(t => {
+    let orig = ChromeUtils.createOriginAttributesFromOrigin(uri + t[0]);
+    checkValues(orig, t[1]);
+    let mod = orig;
+    mod.firstPartyDomain = "";
+    checkValues(mod, t[2]);
+    Assert.equal(ChromeUtils.originAttributesToSuffix(mod), t[3]);
+  });
+
+  var fileURI = makeURI("file:///foo/bar").QueryInterface(Ci.nsIFileURL);
+  var fileTests = [
+    [true, fileURI.spec],
+    [false, "file://UNIVERSAL_FILE_URI_ORIGIN"],
+  ];
+  fileTests.forEach(t => {
+    Services.prefs.setBoolPref("security.fileuri.strict_origin_policy", t[0]);
+    var filePrin = ssm.createContentPrincipal(fileURI, {});
+    Assert.equal(filePrin.origin, t[1]);
+  });
+  Services.prefs.clearUserPref("security.fileuri.strict_origin_policy");
+
+  var aboutBlankURI = makeURI("about:blank");
+  var aboutBlankPrin = ssm.createContentPrincipal(aboutBlankURI, {});
+  Assert.ok(
+    /^moz-nullprincipal:\{([0-9]|[a-z]|\-){36}\}$/.test(aboutBlankPrin.origin)
+  );
+}
diff --git a/caps/tests/unit/test_precursor_principal.js b/caps/tests/unit/test_precursor_principal.js
new file mode 100644
index 0000000000..37c1ae13bc
--- /dev/null
+++ b/caps/tests/unit/test_precursor_principal.js
@@ -0,0 +1,259 @@
+"use strict";
+const { TestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TestUtils.sys.mjs"
+);
+const { XPCShellContentUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/XPCShellContentUtils.sys.mjs"
+);
+const { ExtensionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/ExtensionXPCShellUtils.sys.mjs"
+);
+
+XPCShellContentUtils.init(this);
+ExtensionTestUtils.init(this);
+
+const server = XPCShellContentUtils.createHttpServer({
+  hosts: ["example.com", "example.org"],
+});
+
+server.registerPathHandler("/static_frames", (request, response) => {
+  response.setHeader("Content-Type", "text/html");
+  response.write(`
+    <iframe name="same_origin" sandbox="allow-scripts allow-same-origin" src="http://example.com/frame"></iframe>
+    <iframe name="same_origin_sandbox" sandbox="allow-scripts" src="http://example.com/frame"></iframe>
+    <iframe name="cross_origin" sandbox="allow-scripts allow-same-origin" src="http://example.org/frame"></iframe>
+    <iframe name="cross_origin_sandbox" sandbox="allow-scripts" src="http://example.org/frame"></iframe>
+    <iframe name="data_uri" sandbox="allow-scripts allow-same-origin" src="data:text/html,<h1>Data Subframe</h1>"></iframe>
+    <iframe name="data_uri_sandbox" sandbox="allow-scripts" src="data:text/html,<h1>Data Subframe</h1>"></iframe>
+    <iframe name="srcdoc" sandbox="allow-scripts allow-same-origin" srcdoc="<h1>Srcdoc Subframe</h1>"></iframe>
+    <iframe name="srcdoc_sandbox" sandbox="allow-scripts" srcdoc="<h1>Srcdoc Subframe</h1>"></iframe>
+    <iframe name="blank" sandbox="allow-scripts allow-same-origin"></iframe>
+    <iframe name="blank_sandbox" sandbox="allow-scripts"></iframe>
+    <iframe name="redirect_com" sandbox="allow-scripts allow-same-origin" src="/redirect?com"></iframe>
+    <iframe name="redirect_com_sandbox" sandbox="allow-scripts" src="/redirect?com"></iframe>
+    <iframe name="redirect_org" sandbox="allow-scripts allow-same-origin" src="/redirect?org"></iframe>
+    <iframe name="redirect_org_sandbox" sandbox="allow-scripts" src="/redirect?org"></iframe>
+    <iframe name="ext_redirect_com_com" sandbox="allow-scripts allow-same-origin" src="/ext_redirect?com"></iframe>
+    <iframe name="ext_redirect_com_com_sandbox" sandbox="allow-scripts" src="/ext_redirect?com"></iframe>
+    <iframe name="ext_redirect_org_com" sandbox="allow-scripts allow-same-origin" src="http://example.org/ext_redirect?com"></iframe>
+    <iframe name="ext_redirect_org_com_sandbox" sandbox="allow-scripts" src="http://example.org/ext_redirect?com"></iframe>
+    <iframe name="ext_redirect_com_org" sandbox="allow-scripts allow-same-origin" src="/ext_redirect?org"></iframe>
+    <iframe name="ext_redirect_com_org_sandbox" sandbox="allow-scripts" src="/ext_redirect?org"></iframe>
+    <iframe name="ext_redirect_org_org" sandbox="allow-scripts allow-same-origin" src="http://example.org/ext_redirect?org"></iframe>
+    <iframe name="ext_redirect_org_org_sandbox" sandbox="allow-scripts" src="http://example.org/ext_redirect?org"></iframe>
+    <iframe name="ext_redirect_com_data" sandbox="allow-scripts allow-same-origin" src="/ext_redirect?data"></iframe>
+    <iframe name="ext_redirect_com_data_sandbox" sandbox="allow-scripts" src="/ext_redirect?data"></iframe>
+    <iframe name="ext_redirect_org_data" sandbox="allow-scripts allow-same-origin" src="http://example.org/ext_redirect?data"></iframe>
+    <iframe name="ext_redirect_org_data_sandbox" sandbox="allow-scripts" src="http://example.org/ext_redirect?data"></iframe>
+
+    <!-- XXX(nika): These aren't static as they perform loads dynamically - perhaps consider testing them separately? -->
+    <iframe name="client_replace_org_blank" sandbox="allow-scripts allow-same-origin" src="http://example.org/client_replace?blank"></iframe>
+    <iframe name="client_replace_org_blank_sandbox" sandbox="allow-scripts" src="http://example.org/client_replace?blank"></iframe>
+    <iframe name="client_replace_org_data" sandbox="allow-scripts allow-same-origin" src="http://example.org/client_replace?data"></iframe>
+    <iframe name="client_replace_org_data_sandbox" sandbox="allow-scripts" src="http://example.org/client_replace?data"></iframe>
+  `);
+});
+
+server.registerPathHandler("/frame", (request, response) => {
+  response.setHeader("Content-Type", "text/html");
+  response.write(`<h1>HTTP Subframe</h1>`);
+});
+
+server.registerPathHandler("/redirect", (request, response) => {
+  let redirect;
+  if (request.queryString == "com") {
+    redirect = "http://example.com/frame";
+  } else if (request.queryString == "org") {
+    redirect = "http://example.org/frame";
+  } else {
+    response.setStatusLine(request.httpVersion, 404, "Not found");
+    return;
+  }
+
+  response.setStatusLine(request.httpVersion, 302, "Found");
+  response.setHeader("Location", redirect);
+});
+
+server.registerPathHandler("/client_replace", (request, response) => {
+  let redirect;
+  if (request.queryString == "blank") {
+    redirect = "about:blank";
+  } else if (request.queryString == "data") {
+    redirect = "data:text/html,<h1>Data Subframe</h1>";
+  } else {
+    response.setStatusLine(request.httpVersion, 404, "Not found");
+    return;
+  }
+
+  response.setHeader("Content-Type", "text/html");
+  response.write(`
+    <script>
+      window.location.replace(${JSON.stringify(redirect)});
+    </script>
+  `);
+});
+
+add_task(async function sandboxed_precursor() {
+  // Bug 1725345: Make XPCShellContentUtils.createHttpServer support https
+  Services.prefs.setBoolPref("dom.security.https_first", false);
+
+  let extension = await ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["webRequest", "webRequestBlocking", "<all_urls>"],
+    },
+    background() {
+      // eslint-disable-next-line no-undef
+      browser.webRequest.onBeforeRequest.addListener(
+        details => {
+          let url = new URL(details.url);
+          if (!url.pathname.includes("ext_redirect")) {
+            return {};
+          }
+
+          let redirectUrl;
+          if (url.search == "?com") {
+            redirectUrl = "http://example.com/frame";
+          } else if (url.search == "?org") {
+            redirectUrl = "http://example.org/frame";
+          } else if (url.search == "?data") {
+            redirectUrl = "data:text/html,<h1>Data Subframe</h1>";
+          }
+          return { redirectUrl };
+        },
+        { urls: ["<all_urls>"] },
+        ["blocking"]
+      );
+    },
+  });
+  await extension.startup();
+
+  registerCleanupFunction(async function () {
+    await extension.unload();
+  });
+
+  for (let userContextId of [undefined, 1]) {
+    let comURI = Services.io.newURI("http://example.com");
+    let comPrin = Services.scriptSecurityManager.createContentPrincipal(
+      comURI,
+      { userContextId }
+    );
+    let orgURI = Services.io.newURI("http://example.org");
+    let orgPrin = Services.scriptSecurityManager.createContentPrincipal(
+      orgURI,
+      { userContextId }
+    );
+
+    let page = await XPCShellContentUtils.loadContentPage(
+      "http://example.com/static_frames",
+      {
+        remote: true,
+        remoteSubframes: true,
+        userContextId,
+      }
+    );
+    let bc = page.browsingContext;
+
+    ok(
+      bc.currentWindowGlobal.documentPrincipal.equals(comPrin),
+      "toplevel principal matches"
+    );
+
+    // XXX: This is sketchy as heck, but it's also the easiest way to wait for
+    // the `window.location.replace` loads to finish.
+    await TestUtils.waitForCondition(
+      () =>
+        bc.children.every(
+          child =>
+            !child.currentWindowGlobal.documentURI.spec.includes(
+              "/client_replace"
+            )
+        ),
+      "wait for every client_replace global to be replaced"
+    );
+
+    let principals = {};
+    for (let child of bc.children) {
+      notEqual(child.name, "", "child frames must have names");
+      ok(!(child.name in principals), "duplicate child frame name");
+      principals[child.name] = child.currentWindowGlobal.documentPrincipal;
+    }
+
+    function principal_is(name, expected) {
+      let principal = principals[name];
+      info(`${name} = ${principal.origin}`);
+      ok(principal.equals(expected), `${name} is correct`);
+    }
+    function precursor_is(name, precursor) {
+      let principal = principals[name];
+      info(`${name} = ${principal.origin}`);
+      ok(principal.isNullPrincipal, `${name} is null`);
+      ok(
+        principal.precursorPrincipal.equals(precursor),
+        `${name} has the correct precursor`
+      );
+    }
+
+    // Basic loads should have the principals or precursor principals for the
+    // document being loaded.
+    principal_is("same_origin", comPrin);
+    precursor_is("same_origin_sandbox", comPrin);
+
+    principal_is("cross_origin", orgPrin);
+    precursor_is("cross_origin_sandbox", orgPrin);
+
+    // Loads of a data: URI should complete with a sandboxed principal based on
+    // the principal which tried to perform the load.
+    precursor_is("data_uri", comPrin);
+    precursor_is("data_uri_sandbox", comPrin);
+
+    // Loads which inherit principals, such as srcdoc an about:blank loads,
+    // should also inherit sandboxed precursor principals.
+    principal_is("srcdoc", comPrin);
+    precursor_is("srcdoc_sandbox", comPrin);
+
+    principal_is("blank", comPrin);
+    precursor_is("blank_sandbox", comPrin);
+
+    // Redirects shouldn't interfere with the final principal, and it should be
+    // based only on the final URI.
+    principal_is("redirect_com", comPrin);
+    precursor_is("redirect_com_sandbox", comPrin);
+
+    principal_is("redirect_org", orgPrin);
+    precursor_is("redirect_org_sandbox", orgPrin);
+
+    // Extension redirects should act like normal redirects, and still resolve
+    // with the principal or sandboxed principal of the final URI.
+    principal_is("ext_redirect_com_com", comPrin);
+    precursor_is("ext_redirect_com_com_sandbox", comPrin);
+
+    principal_is("ext_redirect_com_org", orgPrin);
+    precursor_is("ext_redirect_com_org_sandbox", orgPrin);
+
+    principal_is("ext_redirect_org_com", comPrin);
+    precursor_is("ext_redirect_org_com_sandbox", comPrin);
+
+    principal_is("ext_redirect_org_org", orgPrin);
+    precursor_is("ext_redirect_org_org_sandbox", orgPrin);
+
+    // When an extension redirects to a data: URI, we use the last non-data: URI
+    // in the chain as the precursor principal.
+    // FIXME: This should perhaps use the extension's principal instead?
+    precursor_is("ext_redirect_com_data", comPrin);
+    precursor_is("ext_redirect_com_data_sandbox", comPrin);
+
+    precursor_is("ext_redirect_org_data", orgPrin);
+    precursor_is("ext_redirect_org_data_sandbox", orgPrin);
+
+    // Check that navigations triggred by script within the frames will have the
+    // correct behaviour when navigating to blank and data URIs.
+    principal_is("client_replace_org_blank", orgPrin);
+    precursor_is("client_replace_org_blank_sandbox", orgPrin);
+
+    precursor_is("client_replace_org_data", orgPrin);
+    precursor_is("client_replace_org_data_sandbox", orgPrin);
+
+    await page.close();
+  }
+  Services.prefs.clearUserPref("dom.security.https_first");
+});
diff --git a/caps/tests/unit/test_site_origin.js b/caps/tests/unit/test_site_origin.js
new file mode 100644
index 0000000000..bbde787f00
--- /dev/null
+++ b/caps/tests/unit/test_site_origin.js
@@ -0,0 +1,184 @@
+const scriptSecMan = Services.scriptSecurityManager;
+
+// SystemPrincipal checks
+let systemPrincipal = scriptSecMan.getSystemPrincipal();
+Assert.ok(systemPrincipal.isSystemPrincipal);
+Assert.equal(systemPrincipal.origin, "[System Principal]");
+Assert.equal(systemPrincipal.originNoSuffix, "[System Principal]");
+Assert.equal(systemPrincipal.siteOrigin, "[System Principal]");
+Assert.equal(systemPrincipal.siteOriginNoSuffix, "[System Principal]");
+
+// ContentPrincipal checks
+let uri1 = Services.io.newURI("http://example.com");
+let prinicpal1 = scriptSecMan.createContentPrincipal(uri1, {
+  userContextId: 11,
+});
+Assert.ok(prinicpal1.isContentPrincipal);
+Assert.equal(prinicpal1.origin, "http://example.com^userContextId=11");
+Assert.equal(prinicpal1.originNoSuffix, "http://example.com");
+Assert.equal(prinicpal1.siteOrigin, "http://example.com^userContextId=11");
+Assert.equal(prinicpal1.siteOriginNoSuffix, "http://example.com");
+
+let uri2 = Services.io.newURI("http://test1.example.com");
+let prinicpal2 = scriptSecMan.createContentPrincipal(uri2, {
+  userContextId: 22,
+});
+Assert.ok(prinicpal2.isContentPrincipal);
+Assert.equal(prinicpal2.origin, "http://test1.example.com^userContextId=22");
+Assert.equal(prinicpal2.originNoSuffix, "http://test1.example.com");
+Assert.equal(prinicpal2.siteOrigin, "http://example.com^userContextId=22");
+Assert.equal(prinicpal2.siteOriginNoSuffix, "http://example.com");
+
+let uri3 = Services.io.newURI("https://test1.test2.example.com:5555");
+let prinicpal3 = scriptSecMan.createContentPrincipal(uri3, {
+  userContextId: 5555,
+});
+Assert.ok(prinicpal3.isContentPrincipal);
+Assert.equal(
+  prinicpal3.origin,
+  "https://test1.test2.example.com:5555^userContextId=5555"
+);
+Assert.equal(prinicpal3.originNoSuffix, "https://test1.test2.example.com:5555");
+Assert.equal(prinicpal3.siteOrigin, "https://example.com^userContextId=5555");
+Assert.equal(prinicpal3.siteOriginNoSuffix, "https://example.com");
+
+let uri4 = Services.io.newURI("https://.example.com:6666");
+let prinicpal4 = scriptSecMan.createContentPrincipal(uri4, {
+  userContextId: 6666,
+});
+Assert.ok(prinicpal4.isContentPrincipal);
+Assert.equal(prinicpal4.origin, "https://.example.com:6666^userContextId=6666");
+Assert.equal(prinicpal4.originNoSuffix, "https://.example.com:6666");
+Assert.equal(prinicpal4.siteOrigin, "https://.example.com^userContextId=6666");
+Assert.equal(prinicpal4.siteOriginNoSuffix, "https://.example.com");
+
+let aboutURI = Services.io.newURI("about:preferences");
+let aboutPrincipal = scriptSecMan.createContentPrincipal(aboutURI, {
+  userContextId: 66,
+});
+Assert.ok(aboutPrincipal.isContentPrincipal);
+Assert.equal(aboutPrincipal.origin, "about:preferences^userContextId=66");
+Assert.equal(aboutPrincipal.originNoSuffix, "about:preferences");
+Assert.equal(aboutPrincipal.siteOrigin, "about:preferences^userContextId=66");
+Assert.equal(aboutPrincipal.siteOriginNoSuffix, "about:preferences");
+
+let viewSourceURI = Services.io.newURI(
+  "view-source:https://test1.test2.example.com"
+);
+let viewSourcePrincipal = scriptSecMan.createContentPrincipal(viewSourceURI, {
+  userContextId: 101,
+});
+Assert.ok(viewSourcePrincipal.isContentPrincipal);
+Assert.ok(viewSourcePrincipal.schemeIs("view-source"));
+Assert.equal(
+  viewSourcePrincipal.origin,
+  "https://test1.test2.example.com^userContextId=101"
+);
+Assert.equal(
+  viewSourcePrincipal.originNoSuffix,
+  "https://test1.test2.example.com"
+);
+Assert.equal(
+  viewSourcePrincipal.siteOrigin,
+  "https://example.com^userContextId=101"
+);
+Assert.equal(viewSourcePrincipal.siteOriginNoSuffix, "https://example.com");
+
+let mozExtensionURI = Services.io.newURI(
+  "moz-extension://924f966d-c93b-4fbf-968a-16608461663c/meh.txt"
+);
+let mozExtensionPrincipal = scriptSecMan.createContentPrincipal(
+  mozExtensionURI,
+  {
+    userContextId: 102,
+  }
+);
+Assert.ok(mozExtensionPrincipal.isContentPrincipal);
+Assert.ok(mozExtensionPrincipal.schemeIs("moz-extension"));
+Assert.equal(
+  mozExtensionPrincipal.origin,
+  "moz-extension://924f966d-c93b-4fbf-968a-16608461663c^userContextId=102"
+);
+Assert.equal(
+  mozExtensionPrincipal.originNoSuffix,
+  "moz-extension://924f966d-c93b-4fbf-968a-16608461663c"
+);
+Assert.equal(
+  mozExtensionPrincipal.siteOrigin,
+  "moz-extension://924f966d-c93b-4fbf-968a-16608461663c^userContextId=102"
+);
+Assert.equal(
+  mozExtensionPrincipal.siteOriginNoSuffix,
+  "moz-extension://924f966d-c93b-4fbf-968a-16608461663c"
+);
+
+let localhostURI = Services.io.newURI(" http://localhost:44203");
+let localhostPrincipal = scriptSecMan.createContentPrincipal(localhostURI, {
+  userContextId: 144,
+});
+Assert.ok(localhostPrincipal.isContentPrincipal);
+Assert.ok(localhostPrincipal.schemeIs("http"));
+Assert.equal(
+  localhostPrincipal.origin,
+  "http://localhost:44203^userContextId=144"
+);
+Assert.equal(localhostPrincipal.originNoSuffix, "http://localhost:44203");
+Assert.equal(
+  localhostPrincipal.siteOrigin,
+  "http://localhost^userContextId=144"
+);
+Assert.equal(localhostPrincipal.siteOriginNoSuffix, "http://localhost");
+
+// NullPrincipal checks
+let nullPrincipal = scriptSecMan.createNullPrincipal({ userContextId: 33 });
+Assert.ok(nullPrincipal.isNullPrincipal);
+Assert.ok(nullPrincipal.origin.includes("moz-nullprincipal"));
+Assert.ok(nullPrincipal.origin.includes("^userContextId=33"));
+Assert.ok(nullPrincipal.originNoSuffix.includes("moz-nullprincipal"));
+Assert.ok(!nullPrincipal.originNoSuffix.includes("^userContextId=33"));
+Assert.ok(nullPrincipal.siteOrigin.includes("moz-nullprincipal"));
+Assert.ok(nullPrincipal.siteOrigin.includes("^userContextId=33"));
+Assert.ok(nullPrincipal.siteOriginNoSuffix.includes("moz-nullprincipal"));
+Assert.ok(!nullPrincipal.siteOriginNoSuffix.includes("^userContextId=33"));
+
+// ExpandedPrincipal checks
+let expandedPrincipal = Cu.getObjectPrincipal(Cu.Sandbox([prinicpal2]));
+Assert.ok(expandedPrincipal.isExpandedPrincipal);
+Assert.equal(
+  expandedPrincipal.origin,
+  "[Expanded Principal [http://test1.example.com^userContextId=22]]^userContextId=22"
+);
+Assert.equal(
+  expandedPrincipal.originNoSuffix,
+  "[Expanded Principal [http://test1.example.com^userContextId=22]]"
+);
+Assert.equal(
+  expandedPrincipal.siteOrigin,
+  "[Expanded Principal [http://test1.example.com^userContextId=22]]^userContextId=22"
+);
+Assert.equal(
+  expandedPrincipal.siteOriginNoSuffix,
+  "[Expanded Principal [http://test1.example.com^userContextId=22]]"
+);
+
+let ipv6URI = Services.io.newURI("https://[2001:db8::ff00:42:8329]:123");
+let ipv6Principal = scriptSecMan.createContentPrincipal(ipv6URI, {
+  userContextId: 6,
+});
+Assert.ok(ipv6Principal.isContentPrincipal);
+Assert.equal(
+  ipv6Principal.origin,
+  "https://[2001:db8::ff00:42:8329]:123^userContextId=6"
+);
+Assert.equal(
+  ipv6Principal.originNoSuffix,
+  "https://[2001:db8::ff00:42:8329]:123"
+);
+Assert.equal(
+  ipv6Principal.siteOrigin,
+  "https://[2001:db8::ff00:42:8329]^userContextId=6"
+);
+Assert.equal(
+  ipv6Principal.siteOriginNoSuffix,
+  "https://[2001:db8::ff00:42:8329]"
+);
diff --git a/caps/tests/unit/test_uri_escaping.js b/caps/tests/unit/test_uri_escaping.js
new file mode 100644
index 0000000000..7feb581295
--- /dev/null
+++ b/caps/tests/unit/test_uri_escaping.js
@@ -0,0 +1,28 @@
+var ssm = Services.scriptSecurityManager;
+
+function makeURI(uri) {
+  return Services.io.newURI(uri);
+}
+
+function createPrincipal(aURI) {
+  try {
+    var uri = makeURI(aURI);
+    var principal = ssm.createContentPrincipal(uri, {});
+    return principal;
+  } catch (e) {
+    return null;
+  }
+}
+
+function run_test() {
+  Assert.equal(createPrincipal("http://test^test/foo^bar#x^y"), null);
+
+  Assert.equal(createPrincipal("http://test^test/foo\\bar"), null);
+
+  Assert.equal(createPrincipal("http://test:2^3/foo\\bar"), null);
+
+  Assert.equal(
+    createPrincipal("http://test/foo^bar").exposableSpec,
+    "http://test/foo%5Ebar"
+  );
+}
diff --git a/caps/tests/unit/xpcshell.toml b/caps/tests/unit/xpcshell.toml
new file mode 100644
index 0000000000..a04efc4be5
--- /dev/null
+++ b/caps/tests/unit/xpcshell.toml
@@ -0,0 +1,16 @@
+[DEFAULT]
+head = ""
+
+["test_ipv6_host_literal.js"]
+
+["test_oa_partitionKey_pattern.js"]
+
+["test_origin.js"]
+
+["test_precursor_principal.js"]
+firefox-appdir = "browser"
+skip-if = ["os == 'android'"]
+
+["test_site_origin.js"]
+
+["test_uri_escaping.js"]