Fast Stream
FastStream is a browser extension that replaces website video players with a custom player focused on buffering and accessibility features.
About Fast Stream
FastStream is a browser extension that replaces detected videos on websites with its own player. It pre-buffers video in the background using fragmentation and parallel requests, and provides subtitle appearance settings with OpenSubtitles search and timing adjustment, audio controls and video adjustments including color-blindness settings, remappable keybinds, and support for MP4, HLS, DASH and YouTube sources.
It does not support livestreams or DRM-protected content, and YouTube playback may have issues. Pre-buffering defaults to a 5GB maximum that can be changed in settings, with developer caution about storage use and SSD wear from frequent large pre-buffering.
Key features
- Replaces detected website videos when extension is toggled on
- Pre-buffers video in background; 5GB default limit adjustable in settings
- Plays MP4, HLS (.m3u8), DASH (.mpd), and YouTube sources
- Searches OpenSubtitles and adjusts subtitle appearance and timing
- Adjusts audio with equalizer, compressor, mixer, mono mode, volume booster
- Adjusts video brightness, contrast, hue, and LMS daltonization for color blindness
Best for: People with slow connections or who need adjustable subtitles, audio, and visual settings for supported web videos.
Good for
- Developer states no telemetry collection and full offline function, except internet-based features like OpenSubtitles search
- Translated into Spanish, Japanese, Russian, Malay, and Italian
- Offers 20+ remappable keybinds and accessible tool buttons
Watch out for
- Does not support livestreams or DRM-protected content
- YouTube playback may fail, and Chrome Web Store version lacks download support
- Large pre-buffering uses storage and frequent use may reduce SSD lifespan
Fast Stream at a glance
- Category
- Software & Utilities › Media Players & Servers
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Media Players & Servers
Fast Stream alternatives
Tools and sites you could use instead, ranked by how closely they match.
Replace website video players with FastStream, a browser extension offering a custom player focused on buffering and accessibility features.
Watch videos in sync with friends using SyncWatch, a browser extension that lists support for Firefox, Chrome, and Opera.
Open source
24 alternatives
ff2mpv adds a browser action for opening the current page URL or a selected link in the mpv media player.
Metastream synchronizes streaming media across Chromium and Firefox, with sessions, chat, a shared queue, and host-managed playback permissions.
uView keeps supported online videos and local media visible in a small always-on-top window while you use other apps.
Use MotionMonkey, a touch-focused semantic player, to find and stream internet videos from text queries.
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Fast Stream FAQ
Which sources can FastStream play?
MP4 files, HLS (.m3u8) streams, DASH (.mpd) streams, and YouTube. On Chrome, YouTube download is not supported unless manually installed.
How do I use FastStream on a page?
Toggle the extension on a page with a video to replace detected videos, open an .m3u8 or .mpd link directly, or use the extension icon and Sources Browser. Local files can be dragged and dropped.
Does it work with livestreams or DRM-protected videos?
No. Livestreams are not supported and DRM-protected content will not function.
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