What does Speedify do?

Speedify focuses on adjusting YouTube playback speed beyond the standard speed options. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Speedify?

Speedify is a consumer product built for firefox users who watch YouTube videos.

Does Speedify have a free plan?

Yes — Speedify is free to use.

What platforms does Speedify run on?

Speedify runs on the web and embeddable surfaces.

Is Speedify still active?

Unverified. Speedify has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to Speedify?

Similar projects tracked by PulseGate include Speedify-Adaptive Speed, YouTube SpeedUp, and SpeedyVideo Extension.

Speedify is developed by João Vaz.

How long has Speedify been around?

Speedify first shipped in 2020.

Back to the index

Speedify

Name: Speedify
Author: João Vaz

mozilla.orgBrowser DevTools & extensions

Speedify is a Firefox browser extension that adds playback speed options from 2.25x through 4.0x to YouTube videos. It is intended for Firefox users who want finer control over video playback speed.

FreeWebEmbeddable

Visit mozilla.org

1alternative

10features

2020since

Overview

10 features

Speedify sits in PulseGate's Browser DevTools & extensions category. It focuses on adjusting YouTube playback speed beyond the standard speed options. It is built as a consumer product for firefox users who watch YouTube videos. Speedify costs nothing to use. It runs on the web and embeddable surfaces.

João Vaz builds and maintains Speedify, and it first shipped in 2020. Key capabilities include youTube support, playback speed control, and 2.25x speed. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

YouTube support
Playback speed control
2.25x speed
2.5x speed
2.75x speed
3.0x speed
3.25x speed
3.5x speed
3.75x speed
4.0x speed

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 17:10 UTC
Speedify verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Speedify

What does Speedify do?: Speedify focuses on adjusting YouTube playback speed beyond the standard speed options. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Speedify?: Speedify is a consumer product built for firefox users who watch YouTube videos.
Does Speedify have a free plan?: Yes — Speedify is free to use.
What platforms does Speedify run on?: Speedify runs on the web and embeddable surfaces.
Is Speedify still active?: Unverified. Speedify has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to Speedify?: Similar projects tracked by PulseGate include Speedify-Adaptive Speed, YouTube SpeedUp, and SpeedyVideo Extension.Speedify-Adaptive Speed YouTube SpeedUp SpeedyVideo Extension
Who makes Speedify?: Speedify is developed by João Vaz.
How long has Speedify been around?: Speedify first shipped in 2020.

At a glance

Pricing: Free
Platforms: Web
First seen: 13 Sep 2026
Built for: Firefox users who watch YouTube videos
Model: B2C
Solves: Adjusting YouTube playback speed beyond the standard speed options.

Registered as

Firefox Add-ons: speedify

Developer

João Vaz

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 13 Sep 2026

Identity audit (13)

Slug: speedify-mozilla-org
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 13 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/speedify

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do