Three Operating Modes

Timer Mode — Pure time management, no content filtering.
Daily sub-mode: a global time quota. Once exhausted, immediate redirection.
Session sub-mode: work/rest cycles. Configure number of sessions, duration and break time. YouTube is blocked during breaks and after the last session.
Keywords Mode — Content-based filtering using video titles and descriptions, with accent- and case-insensitive matching.
Global sub-mode: a single shared timer for all keywords.
Individual sub-mode: a dedicated timer per keyword, with progress bar and remaining time on hover.
Mix Mode — Combines a daily timer (absolute ceiling) with individual keyword timers. Without a detected keyword, only the daily timer counts down. With a keyword, both timers count down in parallel.

Time Management

Time only counts while a video is actively playing. Paused video = paused timer.
Time keeps counting in background tabs or when the browser is minimized, as long as a video is playing.
Anti multi-tab stacking: 1 real second = 1 counted second, regardless of how many videos are open.
Configurable reset time (midnight by default), applied to all modes.
Real-time counter always visible, adapted to the active mode.
Supports regular videos, Shorts, minimized player and embedded players on third-party sites.
Configurable redirect URL in administration settings.

Keyword Import / Export

Export keyword lists to JSON (global and individual keywords with their timers).
Import from JSON with smart merge that preserves already consumed time.
Available in Keywords and Mix modes.

Security and Parental Control

Password protection for all settings (stored securely as a SHA-256 hash, never in plain text).
Modify or remove password (leave field empty to disable).
ON/OFF button also password protected.
100% local data — nothing is sent to external servers.

User Interface

Clean, modern and compact design with collapsible sections.
Dynamic remaining time display adapted to the active mode.
Individual keywords are collapsible: name visible, details on click.
Multilingual: EN, FR, DE, IT, ES, JA, PL, SV.
Choose the interface language manually, or let it follow your browser automatically.
Help link to full documentation.

Acem-Tech

Published Firefox add-on: