Ultrawidify

Aspect ratio fixer for Youtube. Allows improperly encoded videos to properly fit ultrawide and superwide displays (e.g. 21:9) — and it attempts to do so automatically.

Ultrawidify: Aspect Ratio Fixer for Firefox

Ultrawidify is a Firefox add-on that greatly improves video viewing on ultra and super-wide displays. Capable of auto-detecting and fixing aspect ratios for a smoother viewing experience, it supports a wide range of video platforms from Youtube to Twitch, Vimeo to Streamable, and more. In cases where auto-detection isn't possible due to site restrictions, this handy tool provides manual adjustment options. Further features include video alignment, player detection override and stretch video capabilities for improved versatility.
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Add-on stats

Users: 5,958
16
Rating: 4.13
(112)
1 new ratings
Version: 5.1.7 (Last updated: 2024-01-28)
Creation date: 2016-10-16
Weekly download count: 208
Firefox on Android: No
Risk impact: Moderate risk impact
Risk likelihood:
Low risk likelihood
Manifest version: 2
Permissions:
  • storage
  • activeTab
  • <all_urls>
Size: 3.05M
URLs: Website

Ranking

# 1,062 ▲ 2
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Other platforms

Ultrawidify (v6.2.3)
3.41 (299) 50,000
Not available on Android
Ultrawidify (v5.1.7)
3.40 (55) 26,505
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Add-on summary

Analyze keywords

Need to remove unnecessary black bars from this youtube video you're watching? Ultrawidify is here for you. It should work on Youtube, Netflix, Twitch, Vimeo, Streamable (and on embedded videos that are hosted on these sites). It may work elsewhere as well, but no guarantees.

Important note: This addon is only tested and intended to work with Google Chrome specifically. If you're using a different browser, you're on your own. No, Edge is not Google Chrome (and neither is any other chromium-based browser).

FEATURES

1. AUTOMATIC ASPECT RATIO DETECTION Ensures that video will be cropped without you having to lift a finger. It even re-adjusts crop if aspect ratio changes mid-video. Autodetection is not 100% accurate and has some limitations, but it's accurate enough for most cases.

Autodetection is not supported on all sites. Some sites (e.g. Netflix, Disney+, Hulu) use DRM in order to prevent video piracy, and such protection measures interfere with automatic aspect ratio detection.

2. MANUAL ASPECT RATIO CORRECTION

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User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Works well for stretching videos, especially on platforms like YouTube and Twitch
  • Options to customize the stretching aspect ratio (e.g., 16:9, 18:9)
  • Fixes black bar issues effectively for multiple streaming services
  • User-friendly once the settings are adjusted properly
  • Created a positive impact on user experiences with streaming videos
Cons
  • Becomes laggy or unresponsive after prolonged use
  • Has compatibility issues with certain platforms (e.g., DisneyPlus, PrimeVideo)
  • Some users report videos being stuck on sides or corners of the screen
  • Recent updates have led to a decline in performance compared to older versions
  • Requires frequent readjustment of settings for optimal performance
Most mentioned
  • Lag issues and unresponsiveness after watching for a while
  • Black bar issue resolution
  • Need for better performance in recent updates
  • Difficulty in settings adjustment for optimal use
  • Compatibility problems with various streaming platforms
User reviews
by must0, 2025-01-20
Worked great until recently. After watching videos for a while (not using fullscreen) the whole window turns grey and the audio keeps playing but the tab becomes completely unresponsive and can only be fixed by closing the browser
by vandim, 2024-11-23
Works perfectly, using it to stretch youtube videos to 16:9 in fullscreen (no cropping), because some videos have black bars on the left and right sides when in fullscreen, but Ultrawidify fixes that automatically, all you have to do is go into settings and select 16:9 stretch hybrid.
by Tiger II, 2024-11-09
View all user reviews

Add-on safety

Risk impact

Ultrawidify requires a few sensitive permissions. Exercise caution before installing.

Risk likelihood

Ultrawidify has earned a fairly good reputation and likely can be trusted.

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