diff --git a/locales/en-US.yml b/locales/en-US.yml
index 58712657e8..d559b58a94 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -291,6 +291,7 @@ removeAreYouSure: "Are you sure that you want to remove \"{x}\"?"
 deleteAreYouSure: "Are you sure that you want to delete \"{x}\"?"
 resetAreYouSure: "Really reset?"
 areYouSure: "Are you sure?"
+confirmRemoteUrl: "Are you sure that you want to go to \"{x}\"?"
 saved: "Saved"
 messaging: "Chat"
 upload: "Upload"
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 55a95f8fd9..0e560b8ae9 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -1180,6 +1180,10 @@ export interface Locale extends ILocale {
      * よろしいですか？
      */
     "areYouSure": string;
+    /**
+     * 「{x}」を開きますか？
+     */
+    "confirmRemoteUrl": ParameterizedString<"x">;
     /**
      * 保存しました
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index da208147a1..dc501f5802 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -291,6 +291,7 @@ removeAreYouSure: "「{x}」を削除しますか？"
 deleteAreYouSure: "「{x}」を削除しますか？"
 resetAreYouSure: "リセットしますか？"
 areYouSure: "よろしいですか？"
+confirmRemoteUrl: "「{x}」を開きますか？"
 saved: "保存しました"
 messaging: "チャット"
 upload: "アップロード"
diff --git a/packages/frontend/src/plugin.ts b/packages/frontend/src/plugin.ts
index 81233a5a5e..0818eb43f1 100644
--- a/packages/frontend/src/plugin.ts
+++ b/packages/frontend/src/plugin.ts
@@ -6,7 +6,8 @@
 import { ref } from 'vue';
 import { Interpreter, Parser, utils, values } from '@syuilo/aiscript';
 import { aiScriptReadline, createAiScriptEnv } from '@/scripts/aiscript/api.js';
-import { inputText } from '@/os.js';
+import * as os from '@/os.js';
+import { i18n } from '@/i18n.js';
 import { Plugin, noteActions, notePostInterruptors, noteViewInterruptors, postFormActions, userActions, pageViewInterruptors } from '@/store.js';
 
 const parser = new Parser();
@@ -91,8 +92,15 @@ function createPluginEnv(opts: { plugin: Plugin; storageKey: string }): Record<s
 			registerPageViewInterruptor({ pluginId: opts.plugin.id, handler });
 		}),
 		'Plugin:open_url': values.FN_NATIVE(([url]) => {
-			utils.assertString(url);
-			window.open(url.value, '_blank', 'noopener');
+			(async () => {
+				utils.assertString(url);
+				const { canceled } = await os.confirm({
+					type: 'question',
+					text: i18n.tsx.confirmRemoteUrl({x: url.value}),
+				});
+				if (canceled) return;
+				window.open(url.value, '_blank', 'noopener');
+			})();
 		}),
 		'Plugin:config': values.OBJ(config),
 	};