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98 lines
4.5 KiB
Markdown
98 lines
4.5 KiB
Markdown
# Available for Firefox
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[](https://addons.mozilla.org/firefox/addon/speeder/)
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## The science of accelerated playback
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**TL;DR: faster playback translates to better engagement and retention.**
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Average adult reads prose text at
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[250 to 300 words per minute](https://web.archive.org/web/20220325065025/https://www.domtar.com/en/resources/paper-advocacy/paperbecause)
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(wpm). By contrast, the average rate of speech for English speakers is ~150 wpm,
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with slide presentations often closer to 100 wpm. As a result, when given the
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choice, many viewers
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[speed up video playback to ~1.3\~1.5 its recorded rate](https://research.microsoft.com/en-us/um/redmond/groups/coet/compression/chi99/paper.pdf)
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to compensate for the difference.
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Many viewers report that
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[accelerated viewing keeps their attention longer](https://www.enounce.com/docs/BYUPaper020319.pdf):
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faster delivery keeps the viewer more engaged with the content. In fact, with a
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little training many end up watching videos at 2x+ the recorded speed. Some
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studies report that after being exposed to accelerated playback,
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[listeners become uncomfortable](https://web.archive.org/web/20230912173120/http://alumni.media.mit.edu/~barons/html/avios92.html)
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if they are forced to return to normal rate of presentation.
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## Faster HTML5 Video
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HTML5 video provides a native API to accelerate playback of any video. The
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problem is, many players either hide, or limit this functionality. For best
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results playback speed adjustments should be easy and frequent to match the pace
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and content being covered: we don't read at a fixed speed, and similarly, we
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need an easy way to accelerate the video, slow it down, and quickly rewind the
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last point to listen to it a few more times.
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## Using the extension
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[](https://addons.mozilla.org/firefox/addon/speeder/)
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Once the extension is installed simply navigate to any page that offers
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HTML5 video ([example](https://www.youtube.com/watch?v=E9FxNzv1Tr8)), and you'll
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see a speed indicator in top left corner. Hover over the indicator to reveal the
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controls to accelerate, slowdown, and quickly rewind or advance the video. Or,
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even better, simply use your keyboard:
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- **S** - decrease playback speed.
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- **D** - increase playback speed.
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- **R** - reset playback speed to 1.0x.
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- **Z** - rewind video by 10 seconds.
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- **X** - advance video by 10 seconds.
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- **G** - toggle between current and user configurable preferred speed.
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- **V** - show/hide the controller.
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You can customize and reassign the default shortcut keys in the extensions
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settings page, as well as add additional shortcut keys to match your
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preferences. For example, you can assign multiple different "preferred speed"
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shortcuts with different values, which will allow you to quickly toggle between
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your most commonly used speeds. To add a new shortcut, open extension settings
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and choose an action from "Add shortcut…".
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<img width="1760" height="1330" alt="image" src="https://github.com/user-attachments/assets/32e814dd-93ea-4943-8ec9-3eca735447ac" />
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Some sites may assign other functionality to one of the assigned shortcut keys.
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You can record `Shift+<shortcut>` as a separate, exact binding, or use a site
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rule to block the site from capturing a particular Speeder shortcut. Shift is
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not applied automatically to an unshifted binding.
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## Development
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The unpacked extension root is `extension/`. Load that directory in
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`about:debugging`, and run extension tooling against it, for example:
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```sh
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npm test
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npx --yes web-ext@10.6.0 lint --source-dir extension
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```
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## FAQ
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### The video controls are not showing up?
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Speeder works with HTML5 video and, when enabled in settings, HTML5 audio. Check
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that Speeder is enabled for the current site, then use the popup's "Rescan page
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for videos" action after a player loads dynamically. Browser-internal pages and
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players that do not expose HTML5 media to extensions cannot be controlled.
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### What is this fork all about?
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This is a fork of
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[CodeBicycle's Video Speed Controller extension for Firefox](https://github.com/codebicycle/videospeed)
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which is a fork of [Igrigorik's Video Speed Controller extension for Chromium](https://github.com/igrigorik/videospeed).
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The goal of this fork is fix bugs in the upstream code as well as add new features.
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## License
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(GPLv3) - Copyright (c) 2025 Josh Patra
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