Video Tuner Pro by Slonick
Control video playback speed on any site: presets, percentages, and smart live-stream sync.
Available on Firefox for Android™Available on Firefox for Android™
3 Users3 Users
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About this extension
Take control of any video on the web — from one little popup, on virtually any
site. Speed it up, keep live streams on the live edge, and even out loud and
quiet sounds. No accounts, no tracking, nothing leaves your browser.
PLAYBACK SPEED
• Editable presets and a fine slider — one click or drag, on almost any video.
• Set your own preset values and raise the maximum speed as high as you need.
• Remember a speed per YouTube channel, per site, or globally — applied
automatically next time, by priority (channel → site → global).
• An optional on-video badge shows the current speed and the real time left at
that speed. Drag it anywhere on the player.
KEYBOARD SHORTCUTS
• Slower, faster, and reset keys, a hold-to-speed key, and a key per preset.
• All remappable to the key chords you prefer — no mouse needed.
LIVE STREAMS (YouTube Live, Twitch, and more)
• Live-sync catches you back up to the live edge after a pause or a stall, then
returns to normal speed.
• See the true latency to the broadcaster, not just the buffer.
• Rewind a live stream: scrub back and watch the recording at any speed, then
jump to the live edge and it's a live stream again.
AUDIO COMPRESSION
• Evens out loud and quiet parts so you stop reaching for the volume — clear
dialogue, no blasting explosions.
• Start from a Voice, Night, or Movie preset, or fine-tune every knob yourself.
• A live meter shows the effect; an auto mode can follow the speech rate.
MORE
• Super theater on YouTube — one toggle makes theater mode fill the whole
window, and the header hides itself.
• Live graphs for audio levels and the live-stream buffer.
• Light and dark themes, 10 languages.
PRIVACY
No accounts, no analytics, no data ever leaves your browser. Your settings sync
through your own browser profile only.
site. Speed it up, keep live streams on the live edge, and even out loud and
quiet sounds. No accounts, no tracking, nothing leaves your browser.
PLAYBACK SPEED
• Editable presets and a fine slider — one click or drag, on almost any video.
• Set your own preset values and raise the maximum speed as high as you need.
• Remember a speed per YouTube channel, per site, or globally — applied
automatically next time, by priority (channel → site → global).
• An optional on-video badge shows the current speed and the real time left at
that speed. Drag it anywhere on the player.
KEYBOARD SHORTCUTS
• Slower, faster, and reset keys, a hold-to-speed key, and a key per preset.
• All remappable to the key chords you prefer — no mouse needed.
LIVE STREAMS (YouTube Live, Twitch, and more)
• Live-sync catches you back up to the live edge after a pause or a stall, then
returns to normal speed.
• See the true latency to the broadcaster, not just the buffer.
• Rewind a live stream: scrub back and watch the recording at any speed, then
jump to the live edge and it's a live stream again.
AUDIO COMPRESSION
• Evens out loud and quiet parts so you stop reaching for the volume — clear
dialogue, no blasting explosions.
• Start from a Voice, Night, or Movie preset, or fine-tune every knob yourself.
• A live meter shows the effect; an auto mode can follow the speech rate.
MORE
• Super theater on YouTube — one toggle makes theater mode fill the whole
window, and the header hides itself.
• Live graphs for audio levels and the live-stream buffer.
• Light and dark themes, 10 languages.
PRIVACY
No accounts, no analytics, no data ever leaves your browser. Your settings sync
through your own browser profile only.
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Permissions and data
Required permissions:
- Access your data for all websites
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 3.0.8
- Size
- 410.46 KB
- Last updated
- 5 days ago (Jul 3, 2026)
- Related Categories
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection
The developer of this extension asks that you help support its continued development by making a small contribution.