diff --git a/netwerk/cookie/CookieService.cpp b/netwerk/cookie/CookieService.cpp
index 0e77b4736762..514f4d0dd9de 100644
--- a/netwerk/cookie/CookieService.cpp
+++ b/netwerk/cookie/CookieService.cpp
@@ -317,14 +317,15 @@ CookieService::GetCookieStringFromDocument(Document* aDocument,
   // if it isn't, then we can't send a secure cookie over the connection.
   bool potentiallyTurstworthy = principal->GetIsOriginPotentiallyTrustworthy();
 
+  bool thirdParty = true;
   nsPIDOMWindowInner* innerWindow = aDocument->GetInnerWindow();
-  if (NS_WARN_IF(!innerWindow)) {
-    return NS_OK;
+  // in gtests we don't have a window, let's consider those requests as 3rd
+  // party.
+  if (innerWindow) {
+    thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow,
+                                                             nullptr, nullptr);
   }
 
-  bool thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(
-      innerWindow, nullptr, nullptr);
-
   bool stale = false;
   nsTArray<Cookie*> cookieList;
 
@@ -455,13 +456,16 @@ CookieService::SetCookieStringFromDocument(Document* aDocument,
     return NS_OK;
   }
 
+  bool thirdParty = true;
   nsPIDOMWindowInner* innerWindow = aDocument->GetInnerWindow();
-  if (NS_WARN_IF(!innerWindow)) {
-    return NS_OK;
+  // in gtests we don't have a window, let's consider those requests as 3rd
+  // party.
+  if (innerWindow) {
+    thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow,
+                                                             nullptr, nullptr);
   }
 
-  if (nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow, nullptr,
-                                                  nullptr) &&
+  if (thirdParty &&
       !CookieCommons::ShouldIncludeCrossSiteCookieForDocument(cookie)) {
     return NS_OK;
   }
diff --git a/netwerk/cookie/CookieServiceChild.cpp b/netwerk/cookie/CookieServiceChild.cpp
index fe98676101ef..9440ff0c8748 100644
--- a/netwerk/cookie/CookieServiceChild.cpp
+++ b/netwerk/cookie/CookieServiceChild.cpp
@@ -351,14 +351,15 @@ CookieServiceChild::GetCookieStringFromDocument(Document* aDocument,
   nsAutoCString pathFromURI;
   principal->GetFilePath(pathFromURI);
 
+  bool thirdParty = true;
   nsPIDOMWindowInner* innerWindow = aDocument->GetInnerWindow();
-  if (NS_WARN_IF(!innerWindow)) {
-    return NS_OK;
+  // in gtests we don't have a window, let's consider those requests as 3rd
+  // party.
+  if (innerWindow) {
+    thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow,
+                                                             nullptr, nullptr);
   }
 
-  bool thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(
-      innerWindow, nullptr, nullptr);
-
   bool isPotentiallyTrustworthy =
       principal->GetIsOriginPotentiallyTrustworthy();
   int64_t currentTimeInUsec = PR_Now();
@@ -444,13 +445,16 @@ CookieServiceChild::SetCookieStringFromDocument(
     return NS_OK;
   }
 
+  bool thirdParty = true;
   nsPIDOMWindowInner* innerWindow = aDocument->GetInnerWindow();
-  if (NS_WARN_IF(!innerWindow)) {
-    return NS_OK;
+  // in gtests we don't have a window, let's consider those requests as 3rd
+  // party.
+  if (innerWindow) {
+    thirdParty = nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow,
+                                                             nullptr, nullptr);
   }
 
-  if (nsContentUtils::IsThirdPartyWindowOrChannel(innerWindow, nullptr,
-                                                  nullptr) &&
+  if (thirdParty &&
       !CookieCommons::ShouldIncludeCrossSiteCookieForDocument(cookie)) {
     return NS_OK;
   }
diff --git a/netwerk/test/TestCookie.cpp b/netwerk/test/TestCookie.cpp
index 68c229b62e0a..aac9ba57c78e 100644
--- a/netwerk/test/TestCookie.cpp
+++ b/netwerk/test/TestCookie.cpp
@@ -1026,6 +1026,7 @@ TEST(TestCookie, SameSiteLax)
 TEST(TestCookie, OnionSite)
 {
   Preferences::SetBool("dom.securecontext.whitelist_onions", true);
+  Preferences::SetBool("network.cookie.sameSite.laxByDefault", false);
 
   nsresult rv;
   nsCString cookie;