WheelLock for YouTube by Brendano_El_Taco

WheelLock for YouTube Fullscreen

A lightweight Firefox extension that blocks accidental mouse-wheel input while YouTube videos are in fullscreen.

This is especially useful if you are gaming, multitasking on a second monitor, or using your mouse wheel while a fullscreen YouTube video is open and YouTube starts showing overlays or suggested content from unintended scroll input.

Features

• Blocks mouse-wheel input only while YouTube is in fullscreen
• Leaves normal scrolling untouched outside fullscreen
• Runs only on YouTube pages
• Lightweight and focused
• No tracking
• No data collection
• No background scripts

Why this exists

When a YouTube video is fullscreen, accidental mouse-wheel input can trigger unwanted fullscreen UI behavior, overlays, or suggested content.

That is especially annoying when using multiple monitors or when a game does not fully keep the mouse locked to the active window.

WheelLock prevents that by intercepting wheel input only when fullscreen playback is active on supported YouTube pages.

How it works

The extension runs as a content script on YouTube pages and checks whether the page is currently using the browser Fullscreen API.

When fullscreen is active on a supported YouTube video page, the extension blocks mouse-wheel events before they can trigger unwanted scrolling behavior or overlays.

Supported pages

• Standard YouTube watch pages
• Shorts
• Live pages

Privacy

WheelLock for YouTube Fullscreen does not collect, store, transmit, or share any user data.

It runs locally in the browser and only on YouTube pages.