fix: do not initialize any extension related logic in OffTheRecord contexts (#22772)

shell/browser/electron_browser_client.cc

@@ -917,24 +917,26 @@ void ElectronBrowserClient::SiteInstanceGotProcess(
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
   auto* browser_context =
       static_cast<ElectronBrowserContext*>(site_instance->GetBrowserContext());
-  extensions::ExtensionRegistry* registry =
-      extensions::ExtensionRegistry::Get(browser_context);
-  const extensions::Extension* extension =
-      registry->enabled_extensions().GetExtensionOrAppByURL(
-          site_instance->GetSiteURL());
-  if (!extension)
-    return;
+  if (!browser_context->IsOffTheRecord()) {
+    extensions::ExtensionRegistry* registry =
+        extensions::ExtensionRegistry::Get(browser_context);
+    const extensions::Extension* extension =
+        registry->enabled_extensions().GetExtensionOrAppByURL(
+            site_instance->GetSiteURL());
+    if (!extension)
+      return;
 
-  extensions::ProcessMap::Get(browser_context)
-      ->Insert(extension->id(), site_instance->GetProcess()->GetID(),
-               site_instance->GetId());
+    extensions::ProcessMap::Get(browser_context)
+        ->Insert(extension->id(), site_instance->GetProcess()->GetID(),
+                 site_instance->GetId());
 
-  base::PostTask(
-      FROM_HERE, {BrowserThread::IO},
-      base::BindOnce(&extensions::InfoMap::RegisterExtensionProcess,
-                     browser_context->extension_system()->info_map(),
-                     extension->id(), site_instance->GetProcess()->GetID(),
-                     site_instance->GetId()));
+    base::PostTask(
+        FROM_HERE, {BrowserThread::IO},
+        base::BindOnce(&extensions::InfoMap::RegisterExtensionProcess,
+                       browser_context->extension_system()->info_map(),
+                       extension->id(), site_instance->GetProcess()->GetID(),
+                       site_instance->GetId()));
+  }
 #endif  // BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
 }
 
@@ -999,25 +1001,27 @@ void ElectronBrowserClient::SiteInstanceDeleting(
 
   auto* browser_context =
       static_cast<ElectronBrowserContext*>(site_instance->GetBrowserContext());
-  // If this isn't an extension renderer there's nothing to do.
-  extensions::ExtensionRegistry* registry =
-      extensions::ExtensionRegistry::Get(browser_context);
-  const extensions::Extension* extension =
-      registry->enabled_extensions().GetExtensionOrAppByURL(
-          site_instance->GetSiteURL());
-  if (!extension)
-    return;
+  if (!browser_context->IsOffTheRecord()) {
+    // If this isn't an extension renderer there's nothing to do.
+    extensions::ExtensionRegistry* registry =
+        extensions::ExtensionRegistry::Get(browser_context);
+    const extensions::Extension* extension =
+        registry->enabled_extensions().GetExtensionOrAppByURL(
+            site_instance->GetSiteURL());
+    if (!extension)
+      return;
 
-  extensions::ProcessMap::Get(browser_context)
-      ->Remove(extension->id(), site_instance->GetProcess()->GetID(),
-               site_instance->GetId());
+    extensions::ProcessMap::Get(browser_context)
+        ->Remove(extension->id(), site_instance->GetProcess()->GetID(),
+                 site_instance->GetId());
 
-  base::PostTask(
-      FROM_HERE, {BrowserThread::IO},
-      base::BindOnce(&extensions::InfoMap::UnregisterExtensionProcess,
-                     browser_context->extension_system()->info_map(),
-                     extension->id(), site_instance->GetProcess()->GetID(),
-                     site_instance->GetId()));
+    base::PostTask(
+        FROM_HERE, {BrowserThread::IO},
+        base::BindOnce(&extensions::InfoMap::UnregisterExtensionProcess,
+                       browser_context->extension_system()->info_map(),
+                       extension->id(), site_instance->GetProcess()->GetID(),
+                       site_instance->GetId()));
+  }
 #endif
 }
 

shell/browser/electron_browser_context.cc

@@ -139,13 +139,15 @@ ElectronBrowserContext::ElectronBrowserContext(const std::string& partition,
   cookie_change_notifier_ = std::make_unique<CookieChangeNotifier>(this);
 
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  BrowserContextDependencyManager::GetInstance()->CreateBrowserContextServices(
-      this);
+  if (!in_memory_) {
+    BrowserContextDependencyManager::GetInstance()
+        ->CreateBrowserContextServices(this);
 
-  extension_system_ = static_cast<extensions::ElectronExtensionSystem*>(
-      extensions::ExtensionSystem::Get(this));
-  extension_system_->InitForRegularProfile(true /* extensions_enabled */);
-  extension_system_->FinishInitialization();
+    extension_system_ = static_cast<extensions::ElectronExtensionSystem*>(
+        extensions::ExtensionSystem::Get(this));
+    extension_system_->InitForRegularProfile(true /* extensions_enabled */);
+    extension_system_->FinishInitialization();
+  }
 #endif
 }
 
@@ -171,10 +173,12 @@ void ElectronBrowserContext::InitPrefs() {
   prefs_factory.set_user_prefs(pref_store);
 
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  auto* ext_pref_store = new ExtensionPrefStore(
-      ExtensionPrefValueMapFactory::GetForBrowserContext(this),
-      IsOffTheRecord());
-  prefs_factory.set_extension_prefs(ext_pref_store);
+  if (!in_memory_) {
+    auto* ext_pref_store = new ExtensionPrefStore(
+        ExtensionPrefValueMapFactory::GetForBrowserContext(this),
+        IsOffTheRecord());
+    prefs_factory.set_extension_prefs(ext_pref_store);
+  }
 #endif
 
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS) || \
@@ -196,7 +200,8 @@ void ElectronBrowserContext::InitPrefs() {
   ZoomLevelDelegate::RegisterPrefs(registry.get());
   PrefProxyConfigTrackerImpl::RegisterPrefs(registry.get());
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  extensions::ExtensionPrefs::RegisterProfilePrefs(registry.get());
+  if (!in_memory_)
+    extensions::ExtensionPrefs::RegisterProfilePrefs(registry.get());
 #endif
 
 #if BUILDFLAG(ENABLE_BUILTIN_SPELLCHECKER)

shell/browser/electron_browser_context.h

@@ -139,6 +139,8 @@ class ElectronBrowserContext
   }
 
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
+  // Guard usages of extension_system() with !IsOffTheRecord()
+  // There is no extension system for in-memory sessions
   extensions::ElectronExtensionSystem* extension_system() {
     return extension_system_;
   }