YouTube SpeedUp 作成者: GoliafRS

Usage Guide

1. Install
Add the extension (Firefox ≥ 115 ESR). No extra permissions; no data collected.

2. Open YouTube
Navigate to any YouTube video (works across in‑page SPA navigation).

3. Locate the Speedometer
A small speedometer icon appears in the right side of the native player controls.

4. Change Speed
- Wheel Up: increase by +0.25
- Wheel Down: decrease by −0.25
- Left Click / Enter / Space: reset to 1.00
- Arrow Up / Right: +0.25
- Arrow Down / Left: −0.25

5. View Current Speed
Hover the icon to reveal the current playback speed (two decimals). Speed persists across tabs and navigation.

Limits
- Range: 0.25× → 16× (clamped)
- Increment: fixed 0.25×
- Sync: Changes made via YouTube’s native speed menu are reflected instantly.

Accessibility
- Focusable control with ARIA label
- Keyboard interaction fully supported

Privacy & Data
- No data collection (manifest declares required: ["none"])
- Only stores last speed locally (localStorage, numeric value)

Requirements
- Firefox 115+ (ESR baseline)
- Desktop only (not tested on mobile)

Notes
If multiple videos are present (e.g. mini-player), all track the same speed.