UltraWideo

Name: UltraWideo
Rating: 4.3797 (237 reviews)
Author: Devilos LLC

By: Devilos LLC Add-on

Remove black bars and zoom any video to fill your screen — Netflix, YouTube & every site. Any monitor. Free forever.

Overview

Firefox Add-ons Store

Daily users

15,335 ▲ 145

Data as of 2026-09-10

Rating:

4.38

(237)

Version:

4.2.0

Last updated: 2026-09-08

Features & Capabilities

UltraWideo removes black bars and lets you zoom any online video to fill your display, whether you use an ultrawide monitor, 16:9 screen, TV, or watch older 4:3 content. It works across Netflix, YouTube, and other video sites in both fullscreen and inline modes, with automatic video detection—even for small or nested players.

Choose from Normal, Upscale to fill, Stretch to fit, and Custom zoom modes. Fine-tune the frame with scale and pan controls, gestures, and customizable keyboard shortcuts. UltraWideo also offers light and dark themes, accent colors, auto-hiding controls, reduced motion, and support for 40+ languages. Optional Pro features include per-site and per-video settings, letterbox detection, ambient light, adaptive sharpening, voice control, cloud sync, and a customizable mode manager.

User Growth & Download Statistics

Add-on Entertainment Accessibility Design

By:

Daily users:

Rating:

Version:

4.2.0 Last updated: 2026-09-08

Version code:

6469599

Creation date:

2018-07-21

Firefox add-on GUID:

{2339288d-f701-45d0-a57f-a847e9adc6cc}

Firefox add-on numeric ID:

988215

Weekly download count:

471

Firefox on Android:

Yes

Risk:

Permissions:

alarms
tabs
webNavigation
https://uw.wtf/*
https://uw.devilos.org/*

Content scripts matches:

*
uw.wtf

Size:

343.57KB

Email:

co*****@uw.wtf

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-10

Compare stats and ranking:

Ranking

# 602 ▼ 5

Other rankings

#90 in Appearance ▼ 1

#91 in Photos, Music & Videos ▼ 2

#23 in widget keyword 10

#74 in laptop keyword 29 ▼ 2

#99 in zoom keyword 56

Upgrade to see more rankings

Other platforms

UltraWideo – Remove Black Bars & Fit Any Video to Your Screen (v4.2.0)

70,000 4.21

(582)

UltraWideo (v2.4.2)

3,886 2.90

(21)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Devilos LLC

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/ultrawideo/

Email:

co*****@uw.wtf

Website:

https://uw.wtf

Publisher Change History

2026-06-08: n.*****@gmail.com to co*****@uw.wtf

Upgrade to see full email

Permission Change History

2026-07-24: Version 3.5.9 → 4.0.9

Add Permissions: webNavigation https://uw.wtf/* https://uw.devilos.org/*

Remove Permissions: storage https://*/* http://*/*

2024-05-13: Version 3.1.0 → 3.2.0

Add Permissions: alarms tabs

2024-01-30: Version 3.0.4 → 3.0.7

Remove Host permissions: https://*/* http://*/*

Add Permissions: https://*/* http://*/*

2024-01-15: Version 2.5.6 → 3.0.4

Add Host permissions: https://*/* http://*/*

User Reviews

UltraWideo is praised for removing ultrawide letterboxing by stretching videos to fill the screen across many sites, improving viewing on widescreen monitors. It also has a nicer UI and broad cross-site support. Common concerns center on a free-version watermark, subtitle display issues in fullscreen on some services, and paid features behind a subscription (often requiring a GitHub account) without a clear trial. Occasional cropping or plugin-specific fullscreen glitches are also reported.

Pros

Removes black bars on ultrawide displays by stretching videos to fill the screen across many sites.
UI is nicer and easier to use than some alternatives.
Works across a broad range of sites (YouTube, VK, Disney+, etc.) and enables true fullscreen aspect ratios.
Helpful for widescreen content (anime, etc.) and supports stretch mode for the best fit.

Cons

Watermark in the free version, which many users find immersion-breaking or distracting.
Subtitles do not display or are misaligned when stretched or in fullscreen on some streaming sites (Disney+, Apple TV+, etc.).
Premium features are gated behind a paid subscription and may require a GitHub account, with little or no way to trial features before paying.
Fullscreen/viewport issues on certain sites (some videos crop or appear as half-screen; Plex fullscreen problems).
Hotkeys can be unreliable.

Recent reviews

by ja*****, 2026-08-27

by Fi*****, 2026-08-23

View all user reviews ›

Is UltraWideo Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

UltraWideo requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

UltraWideo is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
Medium **** ********* *** ****** **** ****** ********* ********** *** *** ** ****** ** *****
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