Video Speed Controller (YouTube + RuTube)

Video Speed Controller adds an always-visible row of speed buttons, a fine-grained slider, and customizable keyboard shortcuts to videos on YouTube and RuTube.

WHAT IT DOES

• Preset speed buttons positioned right below the video — fully customizable per site (add, remove, reorder), with values up to 10x.
• Inline custom-speed input for one-off odd values without committing them to the preset list.
• Slider for in-between values with a coloured fill that tracks the current speed.
• Single-click a preset = temporary speed for this video only. Double-click = save as the default for that site.
• Configurable hotkeys (default Ctrl+C +0.1 / Ctrl+V -0.1) with a customizable step (0.01 to 1.0). Assign multiple combinations per action so a remote and a keyboard can both trigger changes.
• In-player gear menu with three tabs (General, Shortcuts, Diagnostics) for slider position, language, behavior toggles, and diagnostic tools.
• Toolbar popup mirrors the in-player menu so you can adjust settings without opening a video — includes a dedicated Donate tab for project support.
• Welcome page on first install with a live hotkey editor and an interactive walkthrough of every panel feature.
• Light and dark theme support across panel, popup, settings menu, and welcome page — automatically follows YouTube's theme, RuTube, or your OS preference.
• RuTube-only quality-of-life toggles: hide the overlay player title, hide Premium subscription banners.

When YouTube or RuTube ships a layout change, the panel recovers automatically through a five-strategy discovery chain (cached selector -> exact match -> substring match -> walk up from the video element -> geometric heuristic). A built-in watchdog detects broken state, purges bad cache entries, and re-attaches the panel. If the player SPA-navigates between videos, the panel re-mounts via a MutationObserver without losing your settings.

PRIVACY

• All settings stored locally in browser.storage.local.
• Zero telemetry, zero analytics, zero remote calls.
• AMO data_collection_permissions disclosure set to "none".
• Open source on GitHub for review.

English and Russian. UI language is auto-detected from your browser on first run; switch any time from the gear menu or welcome page.

ACCESSIBILITY

WCAG 2.2 AA contrast ratios, focus-visible rings on all interactive elements, screen-reader-friendly markup with synced html lang attribute.

LICENSE

GPL-3.0-or-later (GNU General Public License version 3 or later).