diff --git a/browser/brave_shields/ad_block_custom_resources_browsertest.cc b/browser/brave_shields/ad_block_custom_resources_browsertest.cc
index ae36928bb455..ec0bcc3c0325 100644
--- a/browser/brave_shields/ad_block_custom_resources_browsertest.cc
+++ b/browser/brave_shields/ad_block_custom_resources_browsertest.cc
@@ -216,3 +216,32 @@ IN_PROC_BROWSER_TEST_F(AdblockCustomResourcesTest, ExecCustomScriptlet) {
 
   EXPECT_EQ("custom-script", EvalJs(web_contents(), "window.test"));
 }
+
+IN_PROC_BROWSER_TEST_F(AdblockCustomResourcesTest, NameConflicts) {
+  constexpr const char kBraveFix[] = "window.test = 'default-script'";
+  constexpr const char kBraveFixResource[] = R"json(
+    [{
+      "name": "brave-fix.js",
+      "kind": { "mime": "application/javascript" },
+      "content": "$1"
+    }]
+  )json";
+
+  UpdateAdBlockResources(base::ReplaceStringPlaceholders(
+      kBraveFixResource, {base::Base64Encode(kBraveFix)}, nullptr));
+
+  NavigateToURL(GURL("brave://settings/shields/filters"));
+
+  constexpr const char kContent[] = "window.test = 'custom-script'";
+
+  ASSERT_TRUE(ClickAddCustomScriptlet(web_contents()));
+  SaveCustomScriptlet("brave-fix", kContent);
+
+  UpdateAdBlockInstanceWithRules("a.com##+js(brave-fix)");
+
+  GURL tab_url =
+      embedded_test_server()->GetURL("a.com", "/cosmetic_filtering.html");
+  NavigateToURL(tab_url);
+
+  EXPECT_EQ("default-script", EvalJs(web_contents(), "window.test"));
+}
diff --git a/browser/ui/webui/settings/brave_adblock_handler.cc b/browser/ui/webui/settings/brave_adblock_handler.cc
index 95c1ccef1dd7..92d7904c2064 100644
--- a/browser/ui/webui/settings/brave_adblock_handler.cc
+++ b/browser/ui/webui/settings/brave_adblock_handler.cc
@@ -335,7 +335,6 @@ void BraveAdBlockHandler::UpdateCustomScriptlet(const base::Value::List& args) {
 void BraveAdBlockHandler::RemoveCustomScriptlet(const base::Value::List& args) {
   CHECK(base::FeatureList::IsEnabled(
       brave_shields::features::kCosmeticFilteringCustomScriptlets));
-  AllowJavascript();
   CHECK(args.size() == 2u && args[0].is_string() && args[1].is_string());
   AllowJavascript();
   auto error_code = g_brave_browser_process->ad_block_service()
diff --git a/components/brave_shields/core/browser/ad_block_custom_resource_provider.cc b/components/brave_shields/core/browser/ad_block_custom_resource_provider.cc
index 867b1cc7babe..bb672077cfb7 100644
--- a/components/brave_shields/core/browser/ad_block_custom_resource_provider.cc
+++ b/components/brave_shields/core/browser/ad_block_custom_resource_provider.cc
@@ -52,7 +52,7 @@ bool IsValidResource(const base::Value& resource) {
 
   if (*mime == kAppJs) {
     // Resource is a scriptlet:
-    if (!base::StartsWith(*name, "brave-") || !base::EndsWith(*name, ".js")) {
+    if (!name->starts_with("brave-") || !name->ends_with(".js")) {
       return false;
     }
   } else {