OverCastUI

OverCastUI – In-Game Browser & YouTube Picture-in-Picture

A Steam Overlay-style Chromium browser, built into Minecraft. Watch YouTube, Twitch or a wiki inside Minecraft. A client-side Fabric web browser overlay with picture-in-picture, tabs and split view. Opens with Shift+Tab and never pauses your game.

Features

• 🪟 Multiple windows draggable, resizable, with tab support
• 🌐 Full browser back/forward/reload/home, address bar, find-in-page, per-tab zoom
• 📺 Picture-in-Picture videos keep playing after you close the overlay
• 🔲 Split view two pages side by side
• 🎨 Theming adjustable opacity and backdrop
• ⌨️ Rebindable hotkey default Shift+Tab, in-game settings menu
• 💤 Tab suspension sleeps idle tabs to save resources
• ⏸️ Never pauses your game

How to use

1. Press Shift+Tab in-game to open the overlay (rebindable in settings).
2. Wait 10-15 seconds for Chromium to download (Only on first install)
3. Enjoy!

❓ FQA ✅

How do I watch YouTube while playing Minecraft?
Install OverCastUI (Fabric). Press Shift+Tab in game, open YouTube, then close the overlay. The video keeps playing in a small picture-in-picture window while you play.

Do I need to install MCEF separately?
No. OverCastUI downloads Chromium by itself the first time you open it, which takes about 10–15 seconds.

Does it pause the game?
No. The overlay opens on top of the game, like the Steam overlay.

Compatibility

• Loader: Fabric
• Minecraft: 1.21.1, 1.21.11, 26.1, 26.1.1, 26.1.2
• Side: Client only
• Requires: Fabric API

**Description
Whether you want an in-game browser to keep a wiki open, a Steam-style web overlay to watch videos while you play, or picture-in-picture for a stream on your second monitor’s worth of screen OvercastUI keeps it all inside Minecraft, no alt-tabbing.