diff --git a/dom/quota/ActorsParent.cpp b/dom/quota/ActorsParent.cpp
index a4a5fe97c475..84e32fabae0e 100644
--- a/dom/quota/ActorsParent.cpp
+++ b/dom/quota/ActorsParent.cpp
@@ -2697,33 +2697,14 @@ Result<uint64_t, nsresult> GetTemporaryStorageLimit(nsIFile& aStorageDir) {
            1024;
   }
 
-  const int64_t teraByte = 1024 * 1024 * 1024 * 1024;
-  const auto maxAllowedCapacity = 8 * teraByte;
-
   // Check for disk capacity of user's device on which storage directory lives.
-  int64_t diskCapacity = maxAllowedCapacity;
-
-  // Log error when default disk capacity is returned due to the error
-  [&aStorageDir, &diskCapacity]() {
-    QM_FAIL(aStorageDir.GetDiskCapacity(&diskCapacity));
-  }();
+  QM_TRY_INSPECT(const int64_t& diskCapacity,
+                 MOZ_TO_RESULT_INVOKE_MEMBER(aStorageDir, GetDiskCapacity));
 
   MOZ_ASSERT(diskCapacity >= 0);
 
   // Allow temporary storage to consume up to 50% of disk capacity.
-  const auto regularCapacityLimit = diskCapacity / 2u;
-
-  // If the disk capacity reported by the operating system is very
-  // large and potentially incorrect due to hardware issues,
-  // a hardcoded limit is supplied instead.
-  auto capacityLimit = maxAllowedCapacity;
-
-  [regularCapacityLimit, maxAllowedCapacity, &capacityLimit]() {
-    QM_TRY(OkIf(regularCapacityLimit >= maxAllowedCapacity), QM_VOID);
-    capacityLimit = regularCapacityLimit;
-  }();
-
-  return capacityLimit;
+  return diskCapacity / 2u;
 }
 
 bool IsOriginUnaccessed(const FullOriginMetadata& aFullOriginMetadata,
diff --git a/xpcom/io/nsLocalFileUnix.cpp b/xpcom/io/nsLocalFileUnix.cpp
index e88565d5659f..321f3a1ff9e7 100644
--- a/xpcom/io/nsLocalFileUnix.cpp
+++ b/xpcom/io/nsLocalFileUnix.cpp
@@ -1492,11 +1492,14 @@ nsresult nsLocalFile::GetDiskInfo(StatInfoFunc&& aStatInfoFunc,
 
   checkedResult = std::forward<StatInfoFunc>(aStatInfoFunc)(fs_buf);
   if (!checkedResult.isValid()) {
-    return NS_ERROR_CANNOT_CONVERT_DATA;
+    return NS_ERROR_FAILURE;
   }
 
-  // If we return an error, *aValue will not be modified.
-  int64_t tentativeResult = checkedResult.value();
+  *aResult = checkedResult.value();
+
+#  ifdef DEBUG_DISK_SPACE
+  printf("DiskInfo: %lu bytes\n", *aResult);
+#  endif
 
 #  if defined(USE_LINUX_QUOTACTL)
 
@@ -1520,21 +1523,15 @@ nsresult nsLocalFile::GetDiskInfo(StatInfoFunc&& aStatInfoFunc,
       && dq.dqb_bhardlimit) {
     checkedResult = std::forward<QuotaInfoFunc>(aQuotaInfoFunc)(dq);
     if (!checkedResult.isValid()) {
-      return NS_ERROR_CANNOT_CONVERT_DATA;
+      return NS_ERROR_FAILURE;
     }
 
-    if (checkedResult.value() < tentativeResult) {
-      tentativeResult = checkedResult.value();
+    if (checkedResult.value() < *aResult) {
+      *aResult = checkedResult.value();
     }
   }
 #  endif
 
-#  ifdef DEBUG_DISK_SPACE
-  printf("DiskInfo: %lu bytes\n", tentativeResult);
-#  endif
-
-  *aResult = tentativeResult;
-
   return NS_OK;
 
 #else
diff --git a/xpcom/io/nsLocalFileWin.cpp b/xpcom/io/nsLocalFileWin.cpp
index 37278f264d6f..4022af8dc1d0 100644
--- a/xpcom/io/nsLocalFileWin.cpp
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -2734,6 +2734,8 @@ nsLocalFile::GetDiskCapacity(int64_t* aDiskCapacity) {
     return NS_ERROR_INVALID_ARG;
   }
 
+  *aDiskCapacity = 0;
+
   nsresult rv = ResolveAndStat();
   if (NS_FAILED(rv)) {
     return rv;