diff --git a/app/BUILD.gn b/app/BUILD.gn
index 61a477df524..b9515e107fd 100644
--- a/app/BUILD.gn
+++ b/app/BUILD.gn
@@ -141,6 +141,7 @@ source_set("unit_tests") {
     "//components/commerce/core:feature_list",
     "//components/compose/core/browser:features",
     "//components/content_settings/core/common:features",
+    "//components/contextual_tasks/public:feature_list",
     "//components/device_signals/core/common:features",
     "//components/embedder_support",
     "//components/enterprise/connectors/core",
diff --git a/app/DEPS b/app/DEPS
index 051bbcbc828..b284ee535b5 100644
--- a/app/DEPS
+++ b/app/DEPS
@@ -27,6 +27,7 @@ include_rules += [
   "+components/component_updater/component_updater_switches.h",
   "+components/compose/core/browser/compose_features.h",
   "+components/content_settings/core/common/features.h",
+  "+components/contextual_tasks/public/features.h",
   "+components/device_signals/core/common/signals_features.h",
   "+components/dom_distiller/core/dom_distiller_switches.h",
   "+components/embedder_support/switches.h",
diff --git a/app/feature_defaults_unittest.cc b/app/feature_defaults_unittest.cc
index bbc17f1f4dc..8aec26f4357 100644
--- a/app/feature_defaults_unittest.cc
+++ b/app/feature_defaults_unittest.cc
@@ -23,6 +23,7 @@
 #include "components/commerce/core/commerce_feature_list.h"
 #include "components/compose/core/browser/compose_features.h"
 #include "components/content_settings/core/common/features.h"
+#include "components/contextual_tasks/public/features.h"
 #include "components/feature_engagement/public/feature_constants.h"
 #include "components/heap_profiling/in_process/heap_profiler_parameters.h"
 #include "components/history/core/browser/features.h"
@@ -134,6 +135,7 @@ TEST(FeatureDefaultsTest, DisabledFeatures) {
       &compose::features::kEnableCompose,
       &content_settings::features::kTrackingProtection3pcd,
       &content_settings::features::kUserBypassUI,
+      &contextual_tasks::kContextualTasks,
 #if !BUILDFLAG(IS_ANDROID)
       &enterprise_signals::features::kDeviceSignalsConsentDialog,
       &extensions_features::kExtensionManifestV2Disabled,
@@ -147,7 +149,9 @@ TEST(FeatureDefaultsTest, DisabledFeatures) {
 #endif
       &features::kBookmarkTriggerForPrefetch,
       &features::kChromeStructuredMetrics,
+      &features::kDevToolsAiAssistanceContextSelectionAgent,
       &features::kDevToolsAiCodeCompletion,
+      &features::kDevToolsAiCodeGeneration,
 #if !BUILDFLAG(IS_ANDROID)
       &features::kDevToolsConsoleInsights,
 #endif  // !BUILDFLAG(IS_ANDROID)
@@ -155,6 +159,7 @@ TEST(FeatureDefaultsTest, DisabledFeatures) {
       &features::kDevToolsNewPermissionDialog,
 #endif  // BUILDFLAG(ENABLE_DEVTOOLS_FRONTEND)
       &features::kDevToolsPrivacyUI,
+      &features::kDevToolsUseGcaApi,
       &features::kDigitalGoodsApi,
       &features::kFedCm,
 #if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
@@ -163,6 +168,7 @@ TEST(FeatureDefaultsTest, DisabledFeatures) {
 #endif
       &features::kHttpsFirstBalancedMode,
       &features::kIdleDetection,
+      &features::kIndigo,
       &features::kNewTabPageTriggerForPrerender2,
       &features::kPrivacySandboxAdsAPIsOverride,
       &features::kPrivacySandboxAdsAPIsM1Override,
diff --git a/chromium_src/chrome/browser/devtools/features.cc b/chromium_src/chrome/browser/devtools/features.cc
index 410cdcdf3bb..5cfd4c457f0 100644
--- a/chromium_src/chrome/browser/devtools/features.cc
+++ b/chromium_src/chrome/browser/devtools/features.cc
@@ -9,11 +9,15 @@
 
 namespace features {
 OVERRIDE_FEATURE_DEFAULT_STATES({{
+    {kDevToolsAiAssistanceContextSelectionAgent,
+     base::FEATURE_DISABLED_BY_DEFAULT},
     {kDevToolsAiCodeCompletion, base::FEATURE_DISABLED_BY_DEFAULT},
+    {kDevToolsAiCodeGeneration, base::FEATURE_DISABLED_BY_DEFAULT},
 #if !BUILDFLAG(IS_ANDROID)
     {kDevToolsConsoleInsights, base::FEATURE_DISABLED_BY_DEFAULT},
 #endif  // !BUILDFLAG(IS_ANDROID)
     {kDevToolsNewPermissionDialog, base::FEATURE_DISABLED_BY_DEFAULT},
+    {kDevToolsUseGcaApi, base::FEATURE_DISABLED_BY_DEFAULT},
 }});
 
 }  // namespace features
diff --git a/chromium_src/chrome/common/chrome_features.cc b/chromium_src/chrome/common/chrome_features.cc
index 6bd14ad1407..a04874c99e9 100644
--- a/chromium_src/chrome/common/chrome_features.cc
+++ b/chromium_src/chrome/common/chrome_features.cc
@@ -15,6 +15,7 @@ OVERRIDE_FEATURE_DEFAULT_STATES({{
     {kChromeStructuredMetrics, base::FEATURE_DISABLED_BY_DEFAULT},
     {kDesktopPWAsTabStripSettings, base::FEATURE_ENABLED_BY_DEFAULT},
     {kHttpsFirstBalancedMode, base::FEATURE_DISABLED_BY_DEFAULT},
+    {kIndigo, base::FEATURE_DISABLED_BY_DEFAULT},
     {kSCTAuditing, base::FEATURE_DISABLED_BY_DEFAULT},
 #if !BUILDFLAG(IS_ANDROID)
     {kTrustSafetySentimentSurvey, base::FEATURE_DISABLED_BY_DEFAULT},
diff --git a/chromium_src/components/contextual_tasks/public/features.cc b/chromium_src/components/contextual_tasks/public/features.cc
new file mode 100644
index 00000000000..73eb919360c
--- /dev/null
+++ b/chromium_src/components/contextual_tasks/public/features.cc
@@ -0,0 +1,18 @@
+/* Copyright (c) 2026 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "components/contextual_tasks/public/features.h"
+
+#include "base/feature_override.h"
+
+#include <components/contextual_tasks/public/features.cc>
+
+namespace contextual_tasks {
+
+OVERRIDE_FEATURE_DEFAULT_STATES({{
+    {kContextualTasks, base::FEATURE_DISABLED_BY_DEFAULT},
+}});
+
+}  // namespace contextual_tasks
diff --git a/renderer/brave_content_renderer_client.cc b/renderer/brave_content_renderer_client.cc
index 3aeecedc9a2..486ae42be57 100644
--- a/renderer/brave_content_renderer_client.cc
+++ b/renderer/brave_content_renderer_client.cc
@@ -109,6 +109,7 @@ void BraveContentRendererClient::
 
   // These features don't have dedicated WebRuntimeFeatures wrappers.
   blink::WebRuntimeFeatures::EnableFeatureFromString("AdTagging", false);
+  blink::WebRuntimeFeatures::EnableFeatureFromString("AIClassifierAPI", false);
   blink::WebRuntimeFeatures::EnableFeatureFromString("DigitalGoods", false);
   if (!base::FeatureList::IsEnabled(blink::features::kFileSystemAccessAPI)) {
     blink::WebRuntimeFeatures::EnableFeatureFromString("FileSystemAccessLocal",
@@ -119,6 +120,7 @@ void BraveContentRendererClient::
   blink::WebRuntimeFeatures::EnableFeatureFromString("FledgeMultiBid", false);
   blink::WebRuntimeFeatures::EnableFeatureFromString("PrivateStateTokens",
                                                      false);
+  blink::WebRuntimeFeatures::EnableFeatureFromString("ProfilerAPI", false);
 
 #if BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
   if (base::FeatureList::IsEnabled(