Ultimate Video Enhancer (UVE) by Aleksandar

Control video playback on any site: speed up to 16x, volume boost, subtitles, and per-site presets. Free tier includes up to 3x speed and 2x volume.

Some features may require payment

Available on Firefox for Android™

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About this extension

Ultimate Video Enhancer (UVE) gives you fine-grained control over HTML5 video playback across the web — without leaving the page you're watching.

Playback speed from 0.1x up to 3x
Volume boost up to 2x
Quick speed presets and keyboard shortcuts
Per-site settings that remember your preferences
Pause/resume the extension globally
Dark/light theme

Speed up to 16x and volume boost up to 6x
Up to 5 saved templates per site
Online subtitle search (YouTube captions + OpenSubtitles)
Manual subtitle upload (.vtt / .srt)
On-page performance monitor
Optional YouTube dislike counter (Return YouTube Dislike API)

UVE detects <video> elements on supported pages and applies your chosen speed and volume settings locally in the browser. Preferences are stored in extension storage on your device.

UVE is free to install and use within the limits above. UVE Pro is an optional upgrade purchased through our website (Lemon Squeezy). License activation is voluntary and only needed for Pro features.

Core features do not require an account. We do not sell user data or run analytics. Optional network requests (license validation, subtitle search, YouTube dislike counts) are described in our Privacy Policy.

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Ultimate Video Enhancer (UVE) by Aleksandar

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Optional data collection, according to the developer: