Created the mondals extension. I want to add it to the turbowarp extension library.

extensions/Scratch_craft_2/modals.js

@@ -0,0 +1,72 @@
+// Name: Modals
+// ID: htmlalert
+// Description: This extension adds modal dialog boxes.
+// By: scratch_craft_2 <https://scratch.mit.edu/users/scratch_craft_2/>
+// License: MPL-2.0
+
+(function (Scratch) {
+    "use strict";
+
+  if (!Scratch.extensions.unsandboxed) {
+    throw new Error("This Extension must run unsandboxed");
+  }
+
+    class modals {
+      getInfo() {
+        return {
+          id: "htmlalert",
+          name: "modals",
+          color1: "#a3c0e1",
+          blocks: [
+            {
+              opcode: "alertb",
+              blockType: Scratch.BlockType.COMMAND,
+              text: "alert [textia]",
+              arguments: {
+                textia: {
+                  defaultValue: "hello!",
+                  type: Scratch.ArgumentType.STRING,
+                },
+            },
+           },
+          {
+              opcode: "Promptb",
+              blockType: Scratch.BlockType.REPORTER,
+              text: "prompt [textip], default value: [classic]",
+              arguments: {
+                textip: {
+                  defaultValue: "what's your name?",
+                  type: Scratch.ArgumentType.STRING,
+                },
+                  classic: {
+                  defaultValue: " ",
+                  type: Scratch.ArgumentType.STRING,
+                },
+            },
+           },
+           { 
+              opcode: "Confirmb",
+              blockType: Scratch.BlockType.BOOLEAN,
+              text: "confirm [textic]",
+              arguments: {
+                textic: {
+                  defaultValue: "Did you see that movie?",
+                  type: Scratch.ArgumentType.STRING,
+                },
+            },
+           },
+          ],
+        };
+      }
+alertb(args) {
+ alert([args.textia]);
+}
+Promptb(args) {
+  return prompt([args.textip], [args.classic]);
+}
+Confirmb(args) {
+  return confirm([args.textic]);
+}
+    }
+    Scratch.extensions.register(new modals());
+  })(Scratch);

extensions/extensions.json

@@ -18,6 +18,7 @@
   "sound",
   "Lily/Video",
   "iframe",
+  "Scratch_craft_2/modals",
   "Clay/htmlEncode",
   "Xeltalliv/clippingblending",
   "clipboard",

images/README.md

@@ -50,6 +50,11 @@ All images in this folder are licensed under the [GNU General Public License ver
  - Created by [@David-Orangemoon](https://scratch.mit.edu/users/pinksheep2917/) in https://github.com/TurboWarp/extensions/pull/103.
  - Font is Noto Sans.
 
+## Scratch_craft_2/modals.png
+ - Created by [scratch_craft_2](https://scratch.mit.edu/users/scratch_craft_2/) in https://github.com/TurboWarp/extensions/pull/2095.
+ - Font is Noto Sans.
+ - Background based on https://turbowarp.org/static/assets/cf07199bb768b01e6ac2a5c68fd8c3bb.svg
+ - Communication icon from https://www.svgrepo.com/svg/533234/message-circle-chat
 ## pointerlock.svg
  - Created by [@True-Fantom](https://scratch.mit.edu/users/TrueFantom/) in https://github.com/TurboWarp/extensions/pull/498.
  - Chain from https://svgsilh.com/ru/image/1300304.html.