diff --git a/components/brave_referrals/browser/brave_referrals_service.cc b/components/brave_referrals/browser/brave_referrals_service.cc
index 968da66ad00..788c3972ef3 100644
--- a/components/brave_referrals/browser/brave_referrals_service.cc
+++ b/components/brave_referrals/browser/brave_referrals_service.cc
@@ -246,8 +246,8 @@ void BraveReferralsService::OnReferralInitLoadComplete(
     return;
   }
 
-  auto parsed_json =
-      base::JSONReader::ReadAndReturnValueWithError(*response_body);
+  auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(
+      *response_body, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_json.has_value() || !parsed_json->is_dict()) {
     LOG(ERROR) << "Failed to parse referral initialization response: "
                << (!parsed_json.has_value() ? parsed_json.error().message
@@ -296,8 +296,8 @@ void BraveReferralsService::OnReferralFinalizationCheckLoadComplete(
     return;
   }
 
-  auto parsed_json =
-      base::JSONReader::ReadAndReturnValueWithError(*response_body);
+  auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(
+      *response_body, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_json.has_value() || !parsed_json->is_dict()) {
     LOG(ERROR) << "Failed to parse referral finalization check response: "
                << (!parsed_json.has_value() ? parsed_json.error().message
diff --git a/components/brave_wallet/browser/keyring_service.cc b/components/brave_wallet/browser/keyring_service.cc
index 79e3b04bced..9f38e81feeb 100644
--- a/components/brave_wallet/browser/keyring_service.cc
+++ b/components/brave_wallet/browser/keyring_service.cc
@@ -1420,7 +1420,8 @@ void KeyringService::ImportEthereumAccountFromJson(
     return;
   }
 
-  auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(json);
+  auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(
+      json, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_json.has_value() || !parsed_json->is_dict()) {
     std::move(callback).Run({});
     return;
diff --git a/components/p3a/star_randomness_points.cc b/components/p3a/star_randomness_points.cc
index 57283d29f8e..37b3feefe61 100644
--- a/components/p3a/star_randomness_points.cc
+++ b/components/p3a/star_randomness_points.cc
@@ -130,7 +130,8 @@ void StarRandomnessPoints::HandleRandomnessResponse(
   }
   url_loaders_[log_type] = nullptr;
   base::JSONReader::Result parsed_body =
-      base::JSONReader::ReadAndReturnValueWithError(*response_body);
+      base::JSONReader::ReadAndReturnValueWithError(
+          *response_body, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_body.has_value() || !parsed_body.value().is_dict()) {
     LOG(ERROR) << "StarRandomnessPoints: failed to parse randomness "
                   "response json: "
diff --git a/components/url_sanitizer/core/browser/url_sanitizer_service.cc b/components/url_sanitizer/core/browser/url_sanitizer_service.cc
index ffcc3217403..f930b530464 100644
--- a/components/url_sanitizer/core/browser/url_sanitizer_service.cc
+++ b/components/url_sanitizer/core/browser/url_sanitizer_service.cc
@@ -54,8 +54,8 @@ std::optional<base::flat_set<std::string>> CreateParamsList(
 
 URLSanitizerService::Config ParseConfig(
     const URLSanitizerComponentInstaller::RawConfig& raw_config) {
-  auto parsed_json =
-      base::JSONReader::ReadAndReturnValueWithError(raw_config.matchers);
+  auto parsed_json = base::JSONReader::ReadAndReturnValueWithError(
+      raw_config.matchers, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_json.has_value()) {
     VLOG(1) << "Error parsing feature JSON [matchers]: "
             << parsed_json.error().message;
@@ -92,8 +92,8 @@ URLSanitizerService::Config ParseConfig(
                                  std::move(*params));
   }
 
-  parsed_json =
-      base::JSONReader::ReadAndReturnValueWithError(raw_config.permissions);
+  parsed_json = base::JSONReader::ReadAndReturnValueWithError(
+      raw_config.permissions, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!parsed_json.has_value()) {
     VLOG(1) << "Error parsing feature JSON [permission]: "
             << parsed_json.error().message;
diff --git a/components/web_discovery/browser/patterns.cc b/components/web_discovery/browser/patterns.cc
index 028c1568ad2..a3b815092ee 100644
--- a/components/web_discovery/browser/patterns.cc
+++ b/components/web_discovery/browser/patterns.cc
@@ -289,7 +289,8 @@ const PatternsURLDetails* PatternsGroup::GetMatchingURLPattern(
 std::unique_ptr<PatternsGroup> ParsePatterns(std::string_view patterns_json) {
   base::AssertLongCPUWorkAllowed();
   const auto patterns_parse_result =
-      base::JSONReader::ReadAndReturnValueWithError(patterns_json);
+      base::JSONReader::ReadAndReturnValueWithError(
+          patterns_json, base::JSON_PARSE_CHROMIUM_EXTENSIONS);
   if (!patterns_parse_result.has_value()) {
     VLOG(1) << "Failed to parse patterns JSON: "
             << patterns_parse_result.error().ToString();