diff --git a/docshell/base/nsDocShellLoadState.cpp b/docshell/base/nsDocShellLoadState.cpp
index 8b0933a0da32..2d54ab4c82cd 100644
--- a/docshell/base/nsDocShellLoadState.cpp
+++ b/docshell/base/nsDocShellLoadState.cpp
@@ -71,6 +71,7 @@ nsDocShellLoadState::nsDocShellLoadState(
   mReferrerInfo = aLoadState.ReferrerInfo();
   mURI = aLoadState.URI();
   mOriginalURI = aLoadState.OriginalURI();
+  mSourceBrowsingContext = aLoadState.SourceBrowsingContext();
   mBaseURI = aLoadState.BaseURI();
   mTriggeringPrincipal = aLoadState.TriggeringPrincipal();
   mPrincipalToInherit = aLoadState.PrincipalToInherit();
@@ -667,6 +668,7 @@ DocShellLoadStateInit nsDocShellLoadState::Serialize() {
       mIsFromProcessingFrameAttributes;
   loadState.URI() = mURI;
   loadState.OriginalURI() = mOriginalURI;
+  loadState.SourceBrowsingContext() = mSourceBrowsingContext;
   loadState.BaseURI() = mBaseURI;
   loadState.TriggeringPrincipal() = mTriggeringPrincipal;
   loadState.PrincipalToInherit() = mPrincipalToInherit;
diff --git a/dom/ipc/DOMTypes.ipdlh b/dom/ipc/DOMTypes.ipdlh
index c01364533274..6780a87c8318 100644
--- a/dom/ipc/DOMTypes.ipdlh
+++ b/dom/ipc/DOMTypes.ipdlh
@@ -266,6 +266,8 @@ struct DocShellLoadStateInit
   // encounters a server side redirect.
   nsIContentSecurityPolicy Csp;
 
+  MaybeDiscardedBrowsingContext SourceBrowsingContext;
+
   nsCString? OriginalURIString;
   int32_t? CancelContentJSEpoch;