diff --git a/js/src/js.msg b/js/src/js.msg
index 8d39df560146..9e2db605bf6e 100644
--- a/js/src/js.msg
+++ b/js/src/js.msg
@@ -688,7 +688,6 @@ MSG_DEF(JSMSG_BIGINT_NEGATIVE_EXPONENT, 0, JSEXN_RANGEERR, "BigInt negative expo
 MSG_DEF(JSMSG_BIGINT_INVALID_SYNTAX, 0, JSEXN_SYNTAXERR, "invalid BigInt syntax")
 MSG_DEF(JSMSG_NOT_BIGINT, 0, JSEXN_TYPEERR, "not a BigInt")
 MSG_DEF(JSMSG_BIGINT_NOT_SERIALIZABLE, 0, JSEXN_TYPEERR, "BigInt value can't be serialized in JSON")
-MSG_DEF(JSMSG_SC_BIGINT_DISABLED, 0, JSEXN_ERR, "BigInt not cloned - feature disabled in receiver")
 
 // BinAST
 MSG_DEF(JSMSG_BINAST,                                    1, JSEXN_SYNTAXERR, "BinAST Parsing Error: {0}")
diff --git a/js/src/shell/fuzz-flags.txt b/js/src/shell/fuzz-flags.txt
index 75c607b2bb8c..b4a60d5bbbf3 100644
--- a/js/src/shell/fuzz-flags.txt
+++ b/js/src/shell/fuzz-flags.txt
@@ -43,9 +43,6 @@
 --spectre-mitigations=on
 --more-compartments
 
-# Experimental JS language features
---no-bigint
-
 # GC-related
 # These 2 flags can cause the shell to slow down
 # --gc-zeal=2
diff --git a/js/src/shell/js.cpp b/js/src/shell/js.cpp
index ed2f39359491..a021397b5c0a 100644
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -6181,13 +6181,6 @@ static bool NewGlobal(JSContext* cx, unsigned argc, Value* vp) {
       behaviors.setDisableLazyParsing(v.toBoolean());
     }
 
-    if (!JS_GetProperty(cx, opts, "enableBigInt", &v)) {
-      return false;
-    }
-    if (v.isBoolean()) {
-      creationOptions.setBigIntEnabled(v.toBoolean());
-    }
-
     if (!JS_GetProperty(cx, opts, "systemPrincipal", &v)) {
       return false;
     }
diff --git a/js/src/tests/non262/extensions/clone-bigint.js b/js/src/tests/non262/extensions/clone-bigint.js
deleted file mode 100644
index 9a41a356132b..000000000000
--- a/js/src/tests/non262/extensions/clone-bigint.js
+++ /dev/null
@@ -1,29 +0,0 @@
-// |reftest| skip-if(!xulRuntime.shell)
-// -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
-// Any copyright is dedicated to the Public Domain.
-// http://creativecommons.org/licenses/publicdomain/
-
-function testBigInt(b) {
-    var a = deserialize(serialize(b));
-    assertEq(typeof b, "bigint");
-    assertEq(typeof a, "bigint");
-    assertEq(a, b);
-}
-
-testBigInt(0n);
-testBigInt(-1n);
-testBigInt(1n);
-
-testBigInt(0xffffFFFFffffFFFFffffFFFFffffFFFFn);
-testBigInt(-0xffffFFFFffffFFFFffffFFFFffffFFFFn);
-
-var g = newGlobal({ enableBigInt: false });
-var deserializeNoBigInt = g.evaluate("deserialize");
-
-assertEq(deserializeNoBigInt(serialize(1)), 1);
-assertThrows(() => deserializeNoBigInt(serialize(1n)))
-assertThrows(() => deserializeNoBigInt(serialize(0n)))
-assertThrows(() => deserializeNoBigInt(serialize(0xffffffn)))
-assertThrows(() => deserializeNoBigInt(serialize(-1n)))
-
-reportCompare(0, 0, 'ok');
diff --git a/js/src/vm/StructuredClone.cpp b/js/src/vm/StructuredClone.cpp
index e09b2ec7c248..74d3e11697f3 100644
--- a/js/src/vm/StructuredClone.cpp
+++ b/js/src/vm/StructuredClone.cpp
@@ -2043,12 +2043,6 @@ JSString* JSStructuredCloneReader::readString(uint32_t data) {
 }
 
 BigInt* JSStructuredCloneReader::readBigInt(uint32_t data) {
-  if (!context()->realm()->creationOptions().getBigIntEnabled()) {
-    JS_ReportErrorNumberASCII(context(), GetErrorMessage, nullptr,
-                              JSMSG_SC_BIGINT_DISABLED);
-    return nullptr;
-  }
-
   size_t length = data & JS_BITMASK(31);
   bool isNegative = data & (1 << 31);
   if (length == 0) {