YouTube Time Blocker от Pravi Ravi

YouTube Time Blocker is a lightweight focus tool. You set a daily allowance (default 1 hour). While YouTube is your active tab, time counts down. When the allowance runs out, all YouTube tabs redirect to a block page until local midnight.

Features:
• Toggle blocking on/off from the toolbar popup
• Configurable daily allowance with quick presets (15m, 30m, 1h, 2h, always-block)
• Live "time left today" countdown in the popup
• "+15 min" bonus button in the popup and on the block page (current day only)
• Automatic reset at local midnight
• Tracks time only when a YouTube tab is the active tab in a focused window — background tabs don't count
• Blocks *.youtube.com and youtu.be