Video Speed Controller (YouTube + RuTube) by MaxScorpy

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.

WHY IT'S RELIABLE

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.

LANGUAGES

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).