# Franspose

> Transpose pitch and playback speed for video and audio in the page, with transport controls.

Canonical page: [https://chrome-stats.com/d/franspose](https://chrome-stats.com/d/franspose)

## Overview

- **ID:** `franspose`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** o61iqz
- **Category:** photos-music-videos
- **Daily users:** 13
- **Weekly downloads:** 3
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.0.0
- **Last updated:** 2026-04-30
- **First published:** 2026-04-27
- **Size:** 74 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/franspose/)

## Description

Firefox extension that <strong>transposes pitch</strong> and <strong>adjusts playback speed</strong> for audio and video on the page, with a small <strong>transport bar</strong> (play/pause, ±1s/±5s). Settings are remembered <strong>per page URL</strong> in <code>browser.storage.local</code>.

This branch (<strong><code>no-marker-loop</code></strong>) is the <strong>1.0.0-n</strong> line: it does <strong>not</strong> include marker bookmarks or A-B loop playback.

<strong>== Features ==</strong>
<ul><li><strong>Semitones</strong> (−12 … +12) and <strong>fine tune</strong> (cents) with <strong>Signalsmith Stretch</strong> audio worklet</li><li><strong>Playback speed</strong> (0.25× … 2×) with pitch handling via the stretch pipeline.</li><li><strong>Effects on/off</strong> and <strong>reset</strong> for the current site.</li><li><strong>Light/dark</strong> theme (popup + settings); theme preference is stored globally.</li><li><strong>Settings page</strong>: clear all per-site saved transpose data; diagnostics (version / storage counts only, no URL dump).</li></ul>
<strong>Data:</strong> Nothing is sent to a remote server; data stays in the browser.

## Rankings

- #29,440 — Overall
- #16 — transpose

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `webNavigation`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Transpose](https://chrome-stats.com/d/transpose) — 802 users, 3.67 / 5
- [Speed-Pitch changer](https://chrome-stats.com/d/speed-pitch-changer) — 6,841 users, 4.24 / 5
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- [Video Speed Controller](https://chrome-stats.com/d/videospeed-minimal-patched) — 19 users, 1.00 / 5
- [Video Speed Controller (Unofficial-FF-Fork)](https://chrome-stats.com/d/video-speed-controller-fork) — 3 users, 5.00 / 5
- [Tune Shifter](https://chrome-stats.com/d/tune-shifter) — 5 users, 5.00 / 5
- [Playback Speed Extension](https://chrome-stats.com/d/playback-speed-extension) — 24 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/franspose)