diff --git a/docshell/base/LoadContext.cpp b/docshell/base/LoadContext.cpp
index 723d15a51e877..0fe0055a99468 100644
--- a/docshell/base/LoadContext.cpp
+++ b/docshell/base/LoadContext.cpp
@@ -50,7 +50,7 @@ LoadContext::LoadContext(nsIPrincipal* aPrincipal,
   , mIsNotNull(true)
 #endif
 {
-  PrincipalOriginAttributes poa = BasePrincipal::Cast(aPrincipal)->OriginAttributesRef();
+  PrincipalOriginAttributes poa = aPrincipal->OriginAttributesRef();
   mOriginAttributes.InheritFromDocToChildDocShell(poa);
   if (!aOptionalBase) {
     return;
diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 6815c6db5daab..84a8ad2ce77e1 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -3576,7 +3576,7 @@ nsDocShell::CanAccessItem(nsIDocShellTreeItem* aTargetItem,
         nsCOMPtr<nsIPrincipal> accessingPrincipal = accessingDoc->NodePrincipal();
 
         accessingOA.mFirstPartyDomain =
-          BasePrincipal::Cast(accessingPrincipal)->OriginAttributesRef().mFirstPartyDomain;
+          accessingPrincipal->OriginAttributesRef().mFirstPartyDomain;
       }
     }
 
@@ -3590,7 +3590,7 @@ nsDocShell::CanAccessItem(nsIDocShellTreeItem* aTargetItem,
         nsCOMPtr<nsIPrincipal> targetPrincipal = targetDoc->NodePrincipal();
 
         targetOA.mFirstPartyDomain =
-          BasePrincipal::Cast(targetPrincipal)->OriginAttributesRef().mFirstPartyDomain;
+          targetPrincipal->OriginAttributesRef().mFirstPartyDomain;
       }
     }
   }
@@ -7980,7 +7980,7 @@ nsDocShell::CreateAboutBlankContentViewer(nsIPrincipal* aPrincipal,
   if (aPrincipal && !nsContentUtils::IsSystemPrincipal(aPrincipal) &&
       mItemType != typeChrome) {
     MOZ_ASSERT(ChromeUtils::IsOriginAttributesEqualIgnoringAddonId(
-      BasePrincipal::Cast(aPrincipal)->OriginAttributesRef(),
+      aPrincipal->OriginAttributesRef(),
       mOriginAttributes));
   }
 
diff --git a/dom/base/PostMessageEvent.cpp b/dom/base/PostMessageEvent.cpp
index 78d9337df188f..c7f34994fe9be 100644
--- a/dom/base/PostMessageEvent.cpp
+++ b/dom/base/PostMessageEvent.cpp
@@ -113,8 +113,8 @@ PostMessageEvent::Run()
       NS_ENSURE_SUCCESS(rv, rv);
 
       MOZ_DIAGNOSTIC_ASSERT(providedOrigin != targetOrigin ||
-                            (BasePrincipal::Cast(mProvidedPrincipal)->OriginAttributesRef() ==
-                              BasePrincipal::Cast(targetPrin)->OriginAttributesRef()),
+                            (mProvidedPrincipal->OriginAttributesRef() ==
+                              targetPrin->OriginAttributesRef()),
                             "Unexpected postMessage call to a window with mismatched "
                             "origin attributes");
 
diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index d6b44b8fd5a08..6e4432797c3b8 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -2386,7 +2386,7 @@ nsFrameLoader::MaybeCreateDocShell()
   if (parentType == nsIDocShellTreeItem::typeContent &&
       !nsContentUtils::IsSystemPrincipal(doc->NodePrincipal()) &&
       !OwnerIsMozBrowserFrame()) {
-    PrincipalOriginAttributes poa = BasePrincipal::Cast(doc->NodePrincipal())->OriginAttributesRef();
+    PrincipalOriginAttributes poa = doc->NodePrincipal()->OriginAttributesRef();
 
     // Assert on the firstPartyDomain from top-level docshell should be empty
     if (mIsTopLevelContent) {
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 0444051c60ecf..8ca370d78e062 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -2464,8 +2464,7 @@ nsGlobalWindow::ComputeIsSecureContext(nsIDocument* aDocument)
     // IsOriginPotentiallyTrustworthy doesn't care about origin attributes so
     // it doesn't actually matter what we use here, but reusing the document
     // principal's attributes is convenient.
-    const PrincipalOriginAttributes& attrs =
-      BasePrincipal::Cast(principal)->OriginAttributesRef();
+    const PrincipalOriginAttributes& attrs = principal->OriginAttributesRef();
     // CreateCodebasePrincipal correctly gets a useful principal for blob: and
     // other URI_INHERITS_SECURITY_CONTEXT URIs.
     principal = BasePrincipal::CreateCodebasePrincipal(uri, attrs);
@@ -8465,8 +8464,7 @@ nsGlobalWindow::PostMessageMozOuter(JSContext* aCx, JS::Handle<JS::Value> aMessa
       return;
     }
 
-    PrincipalOriginAttributes attrs =
-      BasePrincipal::Cast(&aSubjectPrincipal)->OriginAttributesRef();
+    PrincipalOriginAttributes attrs = aSubjectPrincipal.OriginAttributesRef();
     if (aSubjectPrincipal.GetIsSystemPrincipal()) {
       auto principal = BasePrincipal::Cast(GetPrincipal());
 
diff --git a/dom/console/Console.cpp b/dom/console/Console.cpp
index 8ae1b13f1d7e6..655655df9fae6 100644
--- a/dom/console/Console.cpp
+++ b/dom/console/Console.cpp
@@ -1217,7 +1217,7 @@ Console::MethodInternal(JSContext* aCx, MethodName aMethodName,
       return;
     }
 
-    oa = BasePrincipal::Cast(principal)->OriginAttributesRef();
+    oa = principal->OriginAttributesRef();
 
 #ifdef DEBUG
     if (!nsContentUtils::IsSystemPrincipal(principal)) {
diff --git a/dom/quota/ActorsParent.cpp b/dom/quota/ActorsParent.cpp
index 09e9f87f632e2..b85e5558d34b7 100644
--- a/dom/quota/ActorsParent.cpp
+++ b/dom/quota/ActorsParent.cpp
@@ -4671,7 +4671,7 @@ QuotaManager::GetInfoFromPrincipal(nsIPrincipal* aPrincipal,
   }
 
   nsCString suffix;
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(suffix);
+  aPrincipal->OriginAttributesRef().CreateSuffix(suffix);
 
   if (aSuffix)
   {
diff --git a/dom/quota/QuotaManagerService.cpp b/dom/quota/QuotaManagerService.cpp
index 5380535795073..6af8c218d01e4 100644
--- a/dom/quota/QuotaManagerService.cpp
+++ b/dom/quota/QuotaManagerService.cpp
@@ -572,7 +572,7 @@ QuotaManagerService::ClearStoragesForPrincipal(nsIPrincipal* aPrincipal,
   MOZ_ASSERT(nsContentUtils::IsCallerChrome());
 
   nsCString suffix;
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(suffix);
+  aPrincipal->OriginAttributesRef().CreateSuffix(suffix);
 
   if (NS_WARN_IF(aClearAll && !suffix.IsEmpty())) {
     // The originAttributes should be default originAttributes when the
diff --git a/dom/storage/DOMStorageCache.cpp b/dom/storage/DOMStorageCache.cpp
index 811f79fd3681d..7345fc8408110 100644
--- a/dom/storage/DOMStorageCache.cpp
+++ b/dom/storage/DOMStorageCache.cpp
@@ -133,7 +133,7 @@ DOMStorageCache::Init(DOMStorageManager* aManager,
 
   mInitialized = true;
   mPrincipal = aPrincipal;
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(mOriginSuffix);
+  aPrincipal->OriginAttributesRef().CreateSuffix(mOriginSuffix);
   mPersistent = aPersistent;
   if (aQuotaOriginScope.IsEmpty()) {
     mQuotaOriginScope = Origin();
diff --git a/dom/storage/DOMStorageManager.cpp b/dom/storage/DOMStorageManager.cpp
index 7e6dc2fb92ef5..556a0f40c6fe2 100644
--- a/dom/storage/DOMStorageManager.cpp
+++ b/dom/storage/DOMStorageManager.cpp
@@ -201,7 +201,7 @@ CreateQuotaDBKey(nsIPrincipal* aPrincipal,
   NS_ENSURE_SUCCESS(rv, rv);
 
   aKey.Truncate();
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(aKey);
+  aPrincipal->OriginAttributesRef().CreateSuffix(aKey);
 
   nsAutoCString subdomainsDBKey;
   CreateReversedDomain(eTLDplusOne, subdomainsDBKey);
@@ -315,7 +315,7 @@ DOMStorageManager::GetStorageInternal(bool aCreate,
   nsresult rv;
 
   nsAutoCString originAttrSuffix;
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(originAttrSuffix);
+  aPrincipal->OriginAttributesRef().CreateSuffix(originAttrSuffix);
 
   nsAutoCString originKey;
   rv = AppendOriginNoSuffix(aPrincipal, originKey);
@@ -441,7 +441,7 @@ DOMStorageManager::CheckStorage(nsIPrincipal* aPrincipal,
   }
 
   nsAutoCString suffix;
-  BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(suffix);
+  aPrincipal->OriginAttributesRef().CreateSuffix(suffix);
 
   nsAutoCString origin;
   rv = AppendOriginNoSuffix(aPrincipal, origin);
diff --git a/dom/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index 2f83901c91413..e3995f0c97bb1 100644
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -2427,7 +2427,7 @@ RuntimeService::CreateSharedWorkerFromLoadInfo(JSContext* aCx,
     MOZ_ASSERT(aLoadInfo->mPrincipal);
     nsAutoCString key;
     GenerateSharedWorkerKey(scriptSpec, aName,
-        BasePrincipal::Cast(aLoadInfo->mPrincipal)->OriginAttributesRef(), key);
+        aLoadInfo->mPrincipal->OriginAttributesRef(), key);
 
     if (mDomainMap.Get(aLoadInfo->mDomain, &domainInfo) &&
         domainInfo->mSharedWorkerInfos.Get(key, &sharedWorkerInfo)) {
diff --git a/dom/workers/ServiceWorkerInfo.cpp b/dom/workers/ServiceWorkerInfo.cpp
index 5d7644b63078f..4ce9670f52c84 100644
--- a/dom/workers/ServiceWorkerInfo.cpp
+++ b/dom/workers/ServiceWorkerInfo.cpp
@@ -184,7 +184,7 @@ ServiceWorkerInfo::ServiceWorkerInfo(nsIPrincipal* aPrincipal,
 {
   MOZ_ASSERT(mPrincipal);
   // cache origin attributes so we can use them off main thread
-  mOriginAttributes = BasePrincipal::Cast(mPrincipal)->OriginAttributesRef();
+  mOriginAttributes = mPrincipal->OriginAttributesRef();
   MOZ_ASSERT(!mScope.IsEmpty());
   MOZ_ASSERT(!mScriptSpec.IsEmpty());
   MOZ_ASSERT(!mCacheName.IsEmpty());
diff --git a/dom/workers/ServiceWorkerManager.cpp b/dom/workers/ServiceWorkerManager.cpp
index 2e7cb8f5efdec..a586c23380bb7 100644
--- a/dom/workers/ServiceWorkerManager.cpp
+++ b/dom/workers/ServiceWorkerManager.cpp
@@ -3328,7 +3328,7 @@ ServiceWorkerManager::RemoveAllRegistrations(OriginAttributesPattern* aPattern)
       MOZ_ASSERT(reg->mPrincipal);
 
       bool matches =
-        aPattern->Matches(BasePrincipal::Cast(reg->mPrincipal)->OriginAttributesRef());
+        aPattern->Matches(reg->mPrincipal->OriginAttributesRef());
       if (!matches) {
         continue;
       }
@@ -3892,8 +3892,7 @@ ServiceWorkerManager::UpdateTimerFired(nsIPrincipal* aPrincipal,
     return;
   }
 
-  PrincipalOriginAttributes attrs =
-    BasePrincipal::Cast(aPrincipal)->OriginAttributesRef();
+  PrincipalOriginAttributes attrs = aPrincipal->OriginAttributesRef();
 
   SoftUpdate(attrs, aScope);
 }
diff --git a/dom/workers/ServiceWorkerScriptCache.cpp b/dom/workers/ServiceWorkerScriptCache.cpp
index d6913a51a7339..b7499fd10d8f6 100644
--- a/dom/workers/ServiceWorkerScriptCache.cpp
+++ b/dom/workers/ServiceWorkerScriptCache.cpp
@@ -20,6 +20,7 @@
 
 #include "nsIPrincipal.h"
 #include "nsIScriptError.h"
+#include "nsIScriptSecurityManager.h"
 #include "nsContentUtils.h"
 #include "nsNetUtil.h"
 #include "nsScriptLoader.h"
diff --git a/embedding/components/windowwatcher/nsWindowWatcher.cpp b/embedding/components/windowwatcher/nsWindowWatcher.cpp
index b0e0ff398fe63..2822814db9221 100644
--- a/embedding/components/windowwatcher/nsWindowWatcher.cpp
+++ b/embedding/components/windowwatcher/nsWindowWatcher.cpp
@@ -1104,7 +1104,7 @@ nsWindowWatcher::OpenWindowInternal(mozIDOMWindowProxy* aParent,
         !nsContentUtils::IsSystemOrExpandedPrincipal(subjectPrincipal) &&
         docShell->ItemType() != nsIDocShellTreeItem::typeChrome) {
       DocShellOriginAttributes attrs;
-      attrs.InheritFromDocToChildDocShell(BasePrincipal::Cast(subjectPrincipal)->OriginAttributesRef());
+      attrs.InheritFromDocToChildDocShell(subjectPrincipal->OriginAttributesRef());
       isPrivateBrowsingWindow = !!attrs.mPrivateBrowsingId;
       docShell->SetOriginAttributes(attrs);
     } else {
diff --git a/extensions/cookie/nsPermission.cpp b/extensions/cookie/nsPermission.cpp
index 3d1eb140a276a..4eb9a65438c4d 100644
--- a/extensions/cookie/nsPermission.cpp
+++ b/extensions/cookie/nsPermission.cpp
@@ -110,8 +110,8 @@ nsPermission::Matches(nsIPrincipal* aPrincipal, bool aExactHost, bool* aMatches)
   }
 
   // Compare their OriginAttributes
-  const mozilla::PrincipalOriginAttributes& theirAttrs = mozilla::BasePrincipal::Cast(principal)->OriginAttributesRef();
-  const mozilla::PrincipalOriginAttributes& ourAttrs = mozilla::BasePrincipal::Cast(mPrincipal)->OriginAttributesRef();
+  const mozilla::PrincipalOriginAttributes& theirAttrs = principal->OriginAttributesRef();
+  const mozilla::PrincipalOriginAttributes& ourAttrs = mPrincipal->OriginAttributesRef();
 
   if (theirAttrs != ourAttrs) {
       return NS_OK;
diff --git a/extensions/cookie/nsPermissionManager.cpp b/extensions/cookie/nsPermissionManager.cpp
index d6ed06b9ea95f..2dab718e521d9 100644
--- a/extensions/cookie/nsPermissionManager.cpp
+++ b/extensions/cookie/nsPermissionManager.cpp
@@ -2208,8 +2208,7 @@ nsPermissionManager::GetPermissionHashKey(nsIPrincipal* aPrincipal,
     }
 
     // Copy the attributes over
-    mozilla::PrincipalOriginAttributes attrs =
-      mozilla::BasePrincipal::Cast(aPrincipal)->OriginAttributesRef();
+    mozilla::PrincipalOriginAttributes attrs = aPrincipal->OriginAttributesRef();
 
     // Disable userContext and firstParty isolation for permissions.
     attrs.StripUserContextIdAndFirstPartyDomain();
@@ -2410,7 +2409,7 @@ nsPermissionManager::RemovePermissionsWithAttributes(mozilla::OriginAttributesPa
       continue;
     }
 
-    if (!aPattern.Matches(mozilla::BasePrincipal::Cast(principal)->OriginAttributesRef())) {
+    if (!aPattern.Matches(principal->OriginAttributesRef())) {
       continue;
     }
 
diff --git a/image/imgLoader.cpp b/image/imgLoader.cpp
index eca141fc5de93..cacb100a424fc 100644
--- a/image/imgLoader.cpp
+++ b/image/imgLoader.cpp
@@ -753,7 +753,7 @@ NewImageChannel(nsIChannel** aResult,
       // loadingPrincipal as the channel's originAttributes. This allows the favicon
       // loading from XUL will use the correct originAttributes.
       NeckoOriginAttributes neckoAttrs;
-      neckoAttrs.InheritFromDocToNecko(BasePrincipal::Cast(aLoadingPrincipal)->OriginAttributesRef());
+      neckoAttrs.InheritFromDocToNecko(aLoadingPrincipal->OriginAttributesRef());
 
       nsCOMPtr<nsILoadInfo> loadInfo = (*aResult)->GetLoadInfo();
       rv = loadInfo->SetOriginAttributes(neckoAttrs);
@@ -783,7 +783,7 @@ NewImageChannel(nsIChannel** aResult,
     // has asked us to perform.
     NeckoOriginAttributes neckoAttrs;
     if (aLoadingPrincipal) {
-      neckoAttrs.InheritFromDocToNecko(BasePrincipal::Cast(aLoadingPrincipal)->OriginAttributesRef());
+      neckoAttrs.InheritFromDocToNecko(aLoadingPrincipal->OriginAttributesRef());
     }
     neckoAttrs.mPrivateBrowsingId = aRespectPrivacy ? 1 : 0;
 
@@ -1352,7 +1352,7 @@ imgLoader::FindEntryProperties(nsIURI* uri,
   if (doc) {
     nsCOMPtr<nsIPrincipal> principal = doc->NodePrincipal();
     if (principal) {
-      attrs = BasePrincipal::Cast(principal)->OriginAttributesRef();
+      attrs = principal->OriginAttributesRef();
     }
   }
 
@@ -2114,7 +2114,7 @@ imgLoader::LoadImage(nsIURI* aURI,
   // of post data.
   PrincipalOriginAttributes attrs;
   if (aLoadingPrincipal) {
-    attrs = BasePrincipal::Cast(aLoadingPrincipal)->OriginAttributesRef();
+    attrs = aLoadingPrincipal->OriginAttributesRef();
   }
   ImageCacheKey key(aURI, attrs, aLoadingDocument, rv);
   NS_ENSURE_SUCCESS(rv, rv);
diff --git a/ipc/glue/BackgroundUtils.cpp b/ipc/glue/BackgroundUtils.cpp
index 75893be885d98..d43b946124334 100644
--- a/ipc/glue/BackgroundUtils.cpp
+++ b/ipc/glue/BackgroundUtils.cpp
@@ -154,8 +154,7 @@ PrincipalToPrincipalInfo(nsIPrincipal* aPrincipal,
     }
 
     *aPrincipalInfo =
-      NullPrincipalInfo(BasePrincipal::Cast(aPrincipal)->OriginAttributesRef(),
-                        spec);
+      NullPrincipalInfo(aPrincipal->OriginAttributesRef(), spec);
     return NS_OK;
   }
 
@@ -198,7 +197,7 @@ PrincipalToPrincipalInfo(nsIPrincipal* aPrincipal,
     }
 
     *aPrincipalInfo =
-      ExpandedPrincipalInfo(BasePrincipal::Cast(aPrincipal)->OriginAttributesRef(),
+      ExpandedPrincipalInfo(aPrincipal->OriginAttributesRef(),
                             Move(whitelistInfo));
     return NS_OK;
   }
@@ -221,7 +220,7 @@ PrincipalToPrincipalInfo(nsIPrincipal* aPrincipal,
     return rv;
   }
 
-  *aPrincipalInfo = ContentPrincipalInfo(BasePrincipal::Cast(aPrincipal)->OriginAttributesRef(),
+  *aPrincipalInfo = ContentPrincipalInfo(aPrincipal->OriginAttributesRef(),
                                          spec);
   return NS_OK;
 }
diff --git a/js/xpconnect/src/Sandbox.cpp b/js/xpconnect/src/Sandbox.cpp
index e82f652e1c638..239927ddd3f43 100644
--- a/js/xpconnect/src/Sandbox.cpp
+++ b/js/xpconnect/src/Sandbox.cpp
@@ -1377,7 +1377,7 @@ GetExpandedPrincipal(JSContext* cx, HandleObject arrayObj,
 
             if (!options.originAttributes) {
                 const PrincipalOriginAttributes prinAttrs =
-                    BasePrincipal::Cast(principal)->OriginAttributesRef();
+                    principal->OriginAttributesRef();
                 if (attrs.isNothing()) {
                     attrs.emplace(prinAttrs);
                 } else if (prinAttrs != attrs.ref()) {
diff --git a/js/xpconnect/src/XPCWrappedNativeScope.cpp b/js/xpconnect/src/XPCWrappedNativeScope.cpp
index 24f1067d0d3df..988477bb8b66f 100644
--- a/js/xpconnect/src/XPCWrappedNativeScope.cpp
+++ b/js/xpconnect/src/XPCWrappedNativeScope.cpp
@@ -297,7 +297,7 @@ XPCWrappedNativeScope::EnsureContentXBLScope(JSContext* cx)
     principalAsArray.AppendElement(principal);
     nsCOMPtr<nsIExpandedPrincipal> ep =
         new nsExpandedPrincipal(principalAsArray,
-                                BasePrincipal::Cast(principal)->OriginAttributesRef());
+                                principal->OriginAttributesRef());
 
     // Create the sandbox.
     RootedValue v(cx);
diff --git a/netwerk/base/LoadInfo.cpp b/netwerk/base/LoadInfo.cpp
index 216cf559cd3ed..1091a68da6d6f 100644
--- a/netwerk/base/LoadInfo.cpp
+++ b/netwerk/base/LoadInfo.cpp
@@ -32,7 +32,7 @@ static void
 InheritOriginAttributes(nsIPrincipal* aLoadingPrincipal, NeckoOriginAttributes& aAttrs)
 {
   const PrincipalOriginAttributes attrs =
-    BasePrincipal::Cast(aLoadingPrincipal)->OriginAttributesRef();
+    aLoadingPrincipal->OriginAttributesRef();
   aAttrs.InheritFromDocToNecko(attrs);
 }
 
diff --git a/netwerk/protocol/http/nsHttpAuthManager.cpp b/netwerk/protocol/http/nsHttpAuthManager.cpp
index a2f1b7c5e750c..1de39bdf20f7e 100644
--- a/netwerk/protocol/http/nsHttpAuthManager.cpp
+++ b/netwerk/protocol/http/nsHttpAuthManager.cpp
@@ -70,7 +70,7 @@ nsHttpAuthManager::GetAuthIdentity(const nsACString & aScheme,
 
   nsAutoCString originSuffix;
   if (aPrincipal) {
-    BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(originSuffix);
+    aPrincipal->OriginAttributesRef().CreateSuffix(originSuffix);
   }
 
   if (!aPath.IsEmpty())
@@ -118,10 +118,9 @@ nsHttpAuthManager::SetAuthIdentity(const nsACString & aScheme,
 
   nsAutoCString originSuffix;
   if (aPrincipal) {
-    BasePrincipal::Cast(aPrincipal)->OriginAttributesRef().CreateSuffix(originSuffix);
+    aPrincipal->OriginAttributesRef().CreateSuffix(originSuffix);
   }
 
-
   nsHttpAuthCache* auth_cache = aIsPrivate ? mPrivateAuthCache : mAuthCache;
   return auth_cache->SetAuthEntry(PromiseFlatCString(aScheme).get(),
                                   PromiseFlatCString(aHost).get(),
diff --git a/netwerk/protocol/http/nsHttpHandler.cpp b/netwerk/protocol/http/nsHttpHandler.cpp
index 580db67516f11..42fe2f2a8bc9e 100644
--- a/netwerk/protocol/http/nsHttpHandler.cpp
+++ b/netwerk/protocol/http/nsHttpHandler.cpp
@@ -2311,7 +2311,7 @@ nsHttpHandler::SpeculativeConnectInternal(nsIURI *aURI,
     // loadContext.
     if (aPrincipal) {
         neckoOriginAttributes.InheritFromDocToNecko(
-            BasePrincipal::Cast(aPrincipal)->OriginAttributesRef());
+            aPrincipal->OriginAttributesRef());
     } else if (loadContext) {
         DocShellOriginAttributes docshellOriginAttributes;
         loadContext->GetOriginAttributes(docshellOriginAttributes);