diff --git a/mfbt/double-conversion/double-conversion/utils.h b/mfbt/double-conversion/double-conversion/utils.h
--- a/mfbt/double-conversion/double-conversion/utils.h
+++ b/mfbt/double-conversion/double-conversion/utils.h
@@ -26,38 +26,41 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef DOUBLE_CONVERSION_UTILS_H_
 #define DOUBLE_CONVERSION_UTILS_H_
 
 #include <cstdlib>
 #include <cstring>
 
-#include <cassert>
+#include "mozilla/Assertions.h"
+
 #ifndef DOUBLE_CONVERSION_ASSERT
 #define DOUBLE_CONVERSION_ASSERT(condition)         \
-    assert(condition)
+    MOZ_ASSERT(condition)
 #endif
 #ifndef DOUBLE_CONVERSION_UNIMPLEMENTED
-#define DOUBLE_CONVERSION_UNIMPLEMENTED() (abort())
+#define DOUBLE_CONVERSION_UNIMPLEMENTED() \
+    MOZ_CRASH("DOUBLE_CONVERSION_UNIMPLEMENTED")
 #endif
 #ifndef DOUBLE_CONVERSION_NO_RETURN
 #ifdef _MSC_VER
 #define DOUBLE_CONVERSION_NO_RETURN __declspec(noreturn)
 #else
 #define DOUBLE_CONVERSION_NO_RETURN __attribute__((noreturn))
 #endif
 #endif
 #ifndef DOUBLE_CONVERSION_UNREACHABLE
 #ifdef _MSC_VER
 void DOUBLE_CONVERSION_NO_RETURN abort_noreturn();
-inline void abort_noreturn() { abort(); }
+inline void abort_noreturn() { MOZ_CRASH("abort_noreturn"); }
 #define DOUBLE_CONVERSION_UNREACHABLE()   (abort_noreturn())
 #else
-#define DOUBLE_CONVERSION_UNREACHABLE()   (abort())
+#define DOUBLE_CONVERSION_UNREACHABLE()   \
+    MOZ_CRASH("DOUBLE_CONVERSION_UNREACHABLE")
 #endif
 #endif
 
 // Not all compilers support __has_attribute and combining a check for both
 // ifdef and __has_attribute on the same preprocessor line isn't portable.
 #ifdef __has_attribute
 #   define DOUBLE_CONVERSION_HAS_ATTRIBUTE(x) __has_attribute(x)
 #else