Who is UltraWide YouTube for?

UltraWide YouTube is a consumer product built for youTube viewers with ultrawide monitors.

Is UltraWide YouTube free?

Yes — UltraWide YouTube is free to use.

What platforms does UltraWide YouTube run on?

UltraWide YouTube runs on the web and embeddable surfaces.

Is UltraWide YouTube still active?

Unverified. UltraWide YouTube has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to UltraWide YouTube?

Similar projects tracked by PulseGate include Ultrawidey, UltraWide Video 21:9, and YouTube Windowed FullScreen.

Who develops UltraWide YouTube?

UltraWide YouTube is developed by MijnJeugdWasZwaarMaster.

How long has UltraWide YouTube been around?

UltraWide YouTube first shipped in 2023.

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UltraWide YouTube

Name: UltraWide YouTube
Author: MijnJeugdWasZwaarMaster

mozilla.orgVideo & media players

UltraWide YouTube is a Firefox extension that enlarges the YouTube video player to fill an ultrawide monitor by cropping the video edges. Users can adjust the cropping amount with a slider, from the original aspect ratio to a screen-filling view.

FreeWebEmbeddable

Visit mozilla.org

1alternative

5features

2023since

Overview

5 features

UltraWide YouTube is a Video & media players project. It focuses on watching standard 16:9 YouTube videos in a screen-filling ultrawide aspect ratio. UltraWide YouTube is a consumer product aimed at youTube viewers with ultrawide monitors. It is available for free. It ships for the web and embeddable surfaces.

It is developed by MijnJeugdWasZwaarMaster, and it first shipped in 2023. Among its 5 catalogued features are video cropping, cropping slider, and ultrawide support. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Video cropping
Cropping slider
Ultrawide support
Fullscreen viewing
YouTube integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sept · 14:40 UTC
UltraWide YouTube verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about UltraWide YouTube

What is UltraWide YouTube?: UltraWide YouTube focuses on watching standard 16:9 YouTube videos in a screen-filling ultrawide aspect ratio. It is catalogued under Video & media players on PulseGate.
Who is UltraWide YouTube for?: UltraWide YouTube is a consumer product built for youTube viewers with ultrawide monitors.
Is UltraWide YouTube free?: Yes — UltraWide YouTube is free to use.
What platforms does UltraWide YouTube run on?: UltraWide YouTube runs on the web and embeddable surfaces.
Is UltraWide YouTube still active?: Unverified. UltraWide YouTube has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to UltraWide YouTube?: Similar projects tracked by PulseGate include Ultrawidey, UltraWide Video 21:9, and YouTube Windowed FullScreen.Ultrawidey UltraWide Video 21:9 YouTube Windowed FullScreen
Who develops UltraWide YouTube?: UltraWide YouTube is developed by MijnJeugdWasZwaarMaster.
How long has UltraWide YouTube been around?: UltraWide YouTube first shipped in 2023.

At a glance

Pricing: Free
Platforms: Web
Built for: YouTube viewers with ultrawide monitors
Model: B2C
Solves: Watching standard 16:9 YouTube videos in a screen-filling ultrawide aspect ratio.

Registered as

Firefox Add-ons: ultrawide-youtube

Developer

MijnJeugdWasZwaarMaster

Index record

Indexed: 12 Sept 2026
Lifecycle: Alive
Last seen: 12 Sept 2026

Identity audit (13)

Slug: ultrawide-youtube-mozilla-org
Lifecycle state recorded: 12 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 12 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/ultrawide-youtube

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