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Block YouTube channels with optimized performance and fullscreen scroll prevention
// ==UserScript==
// @name YouTube Channel Blocker v5
// @namespace http://tampermonkey.net/
// @version 5
// @description Block YouTube channels with optimized performance and fullscreen scroll prevention
// @author You
// @match https://www.youtube.com/*
// @grant GM_setValue
// @grant GM_getValue
// @run-at document-end
// ==/UserScript==
(function() {
'use strict';
// Configuration
const CONFIG = {
PROCESS_INTERVAL: 1500,
URL_CHECK_INTERVAL: 800,
INIT_DELAY: 400,
DEBOUNCE_DELAY: 150,
SELECTORS: {
VIDEO: [
'ytd-video-renderer',
'ytd-grid-video-renderer',
'ytd-compact-video-renderer',
'ytd-rich-item-renderer',
'ytd-playlist-video-renderer',
'ytd-reel-item-renderer',
'ytd-movie-renderer'
]
}
};
// State management with performance optimization
const state = {
blockedChannels: GM_getValue('blockedChannels', []),
lastUrl: location.href,
cache: new Map(),
processingQueue: new Set(),
isProcessing: false,
isFullscreen: false,
scrollPreventionActive: false
};
// Utility functions
const utils = {
saveBlocked() {
GM_setValue('blockedChannels', state.blockedChannels);
state.cache.clear();
},
isBlocked(channelName, channelId) {
const cacheKey = `${channelName}:${channelId}`;
if (state.cache.has(cacheKey)) {
return state.cache.get(cacheKey);
}
const blocked = state.blockedChannels.some(b => {
const lower = b.toLowerCase();
return channelName.toLowerCase().includes(lower) ||
(channelId && channelId.toLowerCase() === lower);
});
state.cache.set(cacheKey, blocked);
return blocked;
},
getChannelInfo(video, selector) {
let channelLink;
if (selector === 'ytd-rich-item-renderer') {
const richMedia = video.querySelector('ytd-rich-grid-media');
channelLink = richMedia?.querySelector('a[href*="/@"], a[href*="/channel/"], ytd-channel-name a');
} else {
channelLink = video.querySelector('ytd-channel-name a, #channel-name a, #text a[href*="/@"], a[href*="/channel/"]');
}
if (!channelLink) return null;
const href = channelLink.getAttribute('href') || '';
const channelId = href.split('/').pop().split('?')[0];
return {
name: channelLink.textContent.trim(),
id: channelId,
link: channelLink
};
},
getInsertTarget(video, selector) {
if (selector === 'ytd-rich-item-renderer') {
const richMedia = video.querySelector('ytd-rich-grid-media');
return richMedia?.querySelector('#details, #metadata, #meta');
}
return video.querySelector('#metadata-line, #meta, #metadata, #details, ytd-channel-name');
},
debounce(func, delay) {
let timeoutId;
return function(...args) {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => func.apply(this, args), delay);
};
}
};
// Channel management
const channelManager = {
block(channelName, channelId) {
const identifier = channelId || channelName;
if (state.blockedChannels.includes(identifier)) {
alert(`Channel "${channelName}" is already blocked.`);
return false;
}
state.blockedChannels.push(identifier);
utils.saveBlocked();
alert(`✅ Blocked: ${channelName}\n\nRefresh the page to see changes.`);
ui.updateToggleButton();
return true;
},
unblock(identifier) {
const index = state.blockedChannels.indexOf(identifier);
if (index === -1) return false;
state.blockedChannels.splice(index, 1);
utils.saveBlocked();
ui.updateToggleButton();
return true;
},
exportBlocked() {
const data = JSON.stringify(state.blockedChannels, null, 2);
const blob = new Blob([data], { type: 'application/json' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `youtube-blocked-channels-${Date.now()}.json`;
a.click();
URL.revokeObjectURL(url);
},
importBlocked(jsonData) {
try {
const imported = JSON.parse(jsonData);
if (Array.isArray(imported)) {
const newChannels = imported.filter(ch => !state.blockedChannels.includes(ch));
state.blockedChannels.push(...newChannels);
utils.saveBlocked();
alert(`✅ Imported ${newChannels.length} new channels.\nTotal blocked: ${state.blockedChannels.length}`);
ui.updateToggleButton();
ui.updateBlockedList();
return true;
}
} catch (e) {
alert('❌ Invalid JSON file');
}
return false;
}
};
// Fullscreen handler - NEW ENHANCED VERSION IN v5
const fullscreenHandler = {
preventScroll(e) {
if (state.isFullscreen) {
e.preventDefault();
e.stopPropagation();
return false;
}
},
hideUIElements() {
// Hide all YouTube UI overlays during fullscreen
const elementsToHide = [
'.ytp-chrome-top',
'.ytp-chrome-bottom',
'.ytp-gradient-top',
'.ytp-gradient-bottom',
'.ytp-pause-overlay',
'ytd-engagement-panel-section-list-renderer',
'.ytp-endscreen-content',
'.ytp-ce-element',
'.ytp-cards-teaser',
'.ytp-suggestion-set'
];
elementsToHide.forEach(selector => {
document.querySelectorAll(selector).forEach(el => {
if (state.isFullscreen) {
el.style.setProperty('display', 'none', 'important');
el.style.setProperty('opacity', '0', 'important');
el.style.setProperty('pointer-events', 'none', 'important');
} else {
el.style.removeProperty('display');
el.style.removeProperty('opacity');
el.style.removeProperty('pointer-events');
}
});
});
},
enableScrollPrevention() {
if (state.scrollPreventionActive) return;
// Prevent wheel scrolling
document.addEventListener('wheel', this.preventScroll, { passive: false, capture: true });
// Prevent touch scrolling
document.addEventListener('touchmove', this.preventScroll, { passive: false, capture: true });
// Prevent keyboard scrolling
document.addEventListener('keydown', (e) => {
if (state.isFullscreen && ['ArrowDown', 'ArrowUp', 'PageDown', 'PageUp', 'Space', 'Home', 'End'].includes(e.key)) {
e.preventDefault();
e.stopPropagation();
}
}, { capture: true });
state.scrollPreventionActive = true;
console.log('🚫 Fullscreen scroll prevention enabled');
},
disableScrollPrevention() {
if (!state.scrollPreventionActive) return;
document.removeEventListener('wheel', this.preventScroll, { capture: true });
document.removeEventListener('touchmove', this.preventScroll, { capture: true });
state.scrollPreventionActive = false;
console.log('✅ Fullscreen scroll prevention disabled');
},
handleFullscreenChange() {
const isFullscreen = !!(
document.fullscreenElement ||
document.webkitFullscreenElement ||
document.mozFullScreenElement ||
document.msFullscreenElement ||
document.querySelector('.html5-video-player.ytp-fullscreen')
);
// Update state
state.isFullscreen = isFullscreen;
// Hide/show toggle button
const btn = document.getElementById('blocker-toggle');
if (btn) {
btn.style.display = isFullscreen ? 'none' : 'flex';
}
// Hide/show management panel
const panel = document.getElementById('blocker-panel');
if (panel && isFullscreen) {
panel.style.display = 'none';
}
// Enable/disable scroll prevention
if (isFullscreen) {
this.enableScrollPrevention();
this.hideUIElements();
} else {
this.disableScrollPrevention();
this.hideUIElements(); // Reset UI elements
}
}
};
// Enhanced style injection with better visual indicators
const styles = {
inject() {
const existingStyle = document.getElementById('channel-blocker-style');
if (existingStyle) existingStyle.remove();
const style = document.createElement('style');
style.id = 'channel-blocker-style';
style.textContent = `
${CONFIG.SELECTORS.VIDEO.map(s => `${s}[data-blocked="true"]`).join(',\n')} {
position: relative;
border: 3px solid #ffd700 !important;
border-radius: 8px !important;
padding: 4px !important;
background: rgba(255, 215, 0, 0.05) !important;
}
${CONFIG.SELECTORS.VIDEO.map(s => `${s}[data-blocked="true"] ytd-thumbnail`).join(',\n')} {
border: 4px solid #ffd700 !important;
border-radius: 12px !important;
box-sizing: border-box !important;
pointer-events: none !important;
opacity: 0.6 !important;
}
${CONFIG.SELECTORS.VIDEO.map(s => `${s}[data-blocked="true"] ytd-thumbnail *`).join(',\n')} {
pointer-events: none !important;
}
${CONFIG.SELECTORS.VIDEO.map(s => `${s}[data-blocked="true"] ytd-thumbnail video`).join(',\n')} {
display: none !important;
}
${CONFIG.SELECTORS.VIDEO.map(s => `${s}[data-blocked="true"] #mouseover-overlay, ${s}[data-blocked="true"] #hover-overlays`).join(',\n')} {
display: none !important;
}
.channel-block-btn {
transition: all 0.2s ease !important;
}
.channel-block-btn:hover {
transform: scale(1.05) !important;
filter: brightness(1.1) !important;
}
/* Hide toggle button in fullscreen mode */
.html5-video-player.ytp-fullscreen ~ #blocker-toggle,
body.fullscreen #blocker-toggle,
html[data-fullscreen="true"] #blocker-toggle {
display: none !important;
}
/* NEW in v5: Prevent all overlays in fullscreen */
body.ytp-fullscreen .ytp-pause-overlay,
body.ytp-fullscreen .ytp-chrome-top,
body.ytp-fullscreen .ytp-chrome-bottom {
opacity: 0 !important;
pointer-events: none !important;
}
`;
document.head.appendChild(style);
}
};
// Optimized video processing with batching
const videoProcessor = {
mark() {
const batch = [];
CONFIG.SELECTORS.VIDEO.forEach(selector => {
document.querySelectorAll(`${selector}:not([data-checked])`).forEach(video => {
batch.push({ video, selector });
});
});
// Process in batches to avoid blocking
batch.forEach(({ video, selector }) => {
video.dataset.checked = 'true';
const info = utils.getChannelInfo(video, selector);
if (!info) return;
if (utils.isBlocked(info.name, info.id)) {
video.dataset.blocked = 'true';
}
});
},
addBlockButtons() {
CONFIG.SELECTORS.VIDEO.forEach(selector => {
document.querySelectorAll(`${selector}:not([data-has-button])`).forEach(video => {
if (video.dataset.blocked === 'true') return;
video.dataset.hasButton = 'true';
const info = utils.getChannelInfo(video, selector);
if (!info) return;
const insertTarget = utils.getInsertTarget(video, selector);
if (!insertTarget) return;
const alreadyBlocked = utils.isBlocked(info.name, info.id);
const button = this.createButton(info.name, info.id, alreadyBlocked);
insertTarget.appendChild(button);
});
});
},
addBadges() {
CONFIG.SELECTORS.VIDEO.forEach(selector => {
document.querySelectorAll(`${selector}[data-blocked="true"]:not([data-has-badge])`).forEach(video => {
video.dataset.hasBadge = 'true';
const info = utils.getChannelInfo(video, selector);
if (!info) return;
const insertTarget = utils.getInsertTarget(video, selector);
if (!insertTarget) return;
const badge = this.createBadge(info.name, info.id);
insertTarget.appendChild(badge);
});
});
},
createButton(channelName, channelId, alreadyBlocked) {
const button = document.createElement('button');
button.innerHTML = alreadyBlocked ? '✓ Blocked' : '🚫 Block';
button.className = 'channel-block-btn';
button.style.cssText = `
background: ${alreadyBlocked ? '#666' : '#c00'};
color: white; border: none; padding: 4px 10px;
border-radius: 12px; cursor: pointer; font-size: 11px;
font-weight: 500; margin: 4px 0 4px 8px;
display: inline-block;
`;
button.onclick = (e) => {
e.preventDefault();
e.stopPropagation();
if (alreadyBlocked) {
if (confirm(`Unblock "${channelName}"?`)) {
channelManager.unblock(channelId || channelName);
location.reload();
}
} else {
channelManager.block(channelName, channelId);
}
};
return button;
},
createBadge(channelName, channelId) {
const badge = document.createElement('button');
badge.innerHTML = '✓ Blocked';
badge.className = 'blocked-channel-badge channel-block-btn';
badge.style.cssText = `
background: #ffd700; color: #000; border: none;
padding: 4px 12px; border-radius: 12px; cursor: pointer;
font-size: 11px; font-weight: bold; margin: 4px 0 4px 8px;
display: inline-block;
`;
badge.onclick = (e) => {
e.preventDefault();
e.stopPropagation();
if (confirm(`Unblock channel "${channelName}"?\n\nVideos from this channel will no longer be marked.`)) {
if (channelManager.unblock(channelId || channelName)) {
alert(`✅ Unblocked: ${channelName}`);
location.reload();
}
}
};
return badge;
}
};
// Enhanced channel page handler
const channelPage = {
addButton() {
if (!location.pathname.match(/\/@|\/channel\//)) return;
if (document.getElementById('channel-block-btn')) return;
const nameEl = document.querySelector('yt-dynamic-text-view-model h1 span[role="text"]');
const handleEl = document.querySelector('yt-content-metadata-view-model span[role="text"]');
const channelName = nameEl?.textContent.trim().split('\n')[0] || '';
let channelId = handleEl?.textContent.trim() || '';
if (!channelId.startsWith('@')) {
channelId = '@' + (location.pathname.split('/@')[1] || location.pathname.split('/channel/')[1] || '').split('/')[0];
}
if (!channelName && !channelId) return;
const flexActions = document.querySelector('yt-flexible-actions-view-model');
if (!flexActions) return;
const blocked = utils.isBlocked(channelName, channelId);
const wrapper = document.createElement('div');
wrapper.id = 'channel-block-btn';
wrapper.className = 'ytFlexibleActionsViewModelAction';
const button = document.createElement('button');
button.className = 'yt-spec-button-shape-next yt-spec-button-shape-next--tonal yt-spec-button-shape-next--mono yt-spec-button-shape-next--size-m channel-block-btn';
if (blocked) {
button.style.cssText = `
background: #ffd700 !important; color: #000 !important;
border: 2px solid #000 !important; padding: 10px 24px !important;
font-weight: bold !important;
`;
}
button.innerHTML = `<div class="yt-spec-button-shape-next__button-text-content">${blocked ? '✓ Blocked' : '🚫 Block'}</div>`;
button.onclick = () => {
if (blocked) {
if (confirm(`Unblock "${channelName}"?`)) {
channelManager.unblock(channelId || channelName);
location.reload();
}
} else {
if (confirm(`Block "${channelName}"?`)) {
channelManager.block(channelName, channelId);
}
}
};
wrapper.appendChild(button);
flexActions.appendChild(wrapper);
}
};
// Enhanced UI with import/export functionality
const ui = {
createToggleButton() {
const btn = document.createElement('button');
btn.id = 'blocker-toggle';
btn.innerHTML = `🚫 (${state.blockedChannels.length})`;
btn.title = 'Manage Blocked Channels';
btn.style.cssText = `
position: fixed; top: 70px; right: 20px; background: #c00;
color: white; border: none; padding: 8px 12px; border-radius: 50%;
cursor: grab; z-index: 9999; font-weight: 600; font-size: 16px;
box-shadow: 0 2px 10px rgba(204,0,0,0.5); width: 44px; height: 44px;
display: flex; align-items: center; justify-content: center;
transition: all 0.2s;
`;
btn.onmouseover = () => {
btn.style.transform = 'scale(1.1)';
btn.style.boxShadow = '0 4px 15px rgba(204,0,0,0.7)';
};
btn.onmouseout = () => {
btn.style.transform = 'scale(1)';
btn.style.boxShadow = '0 2px 10px rgba(204,0,0,0.5)';
};
btn.onclick = () => {
const panel = document.getElementById('blocker-panel');
if (panel.style.display === 'none') {
this.updateBlockedList();
panel.style.display = 'block';
} else {
panel.style.display = 'none';
}
};
document.body.appendChild(btn);
this.makeDraggable(btn);
},
updateToggleButton() {
const btn = document.getElementById('blocker-toggle');
if (btn) btn.innerHTML = `🚫 (${state.blockedChannels.length})`;
},
createManagementPanel() {
const panel = document.createElement('div');
panel.id = 'blocker-panel';
panel.style.cssText = `
position: fixed; top: 150px; right: 20px; background: #282828;
border: 2px solid #c00; border-radius: 12px; padding: 20px;
z-index: 10000; max-width: 380px; max-height: 550px;
overflow-y: auto; display: none; color: white;
box-shadow: 0 4px 20px rgba(0,0,0,0.5);
`;
panel.innerHTML = `
<h3 style="margin: 0 0 16px 0; font-size: 18px; border-bottom: 2px solid #c00; padding-bottom: 8px;">
🚫 Blocked Channels
</h3>
<div id="blocked-count" style="margin-bottom: 12px; color: #aaa; font-size: 13px;">
Total: ${state.blockedChannels.length}
</div>
<div id="blocked-list" style="margin-bottom: 16px;"></div>
<div style="display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px;">
<button id="close-panel" style="background: #065fd4; color: white; border: none; padding: 10px; border-radius: 6px; cursor: pointer;">Close</button>
<button id="clear-all" style="background: #c00; color: white; border: none; padding: 10px; border-radius: 6px; cursor: pointer;">Clear All</button>
<button id="export-blocked" style="background: #0a8a0a; color: white; border: none; padding: 10px; border-radius: 6px; cursor: pointer;">Export</button>
<button id="import-blocked" style="background: #f59e0b; color: white; border: none; padding: 10px; border-radius: 6px; cursor: pointer;">Import</button>
</div>
<input type="file" id="import-file" accept=".json" style="display: none;">
`;
document.body.appendChild(panel);
document.getElementById('close-panel').onclick = () => panel.style.display = 'none';
document.getElementById('clear-all').onclick = () => {
if (confirm('Unblock all channels?')) {
state.blockedChannels = [];
utils.saveBlocked();
this.updateBlockedList();
location.reload();
}
};
document.getElementById('export-blocked').onclick = () => channelManager.exportBlocked();
document.getElementById('import-blocked').onclick = () => document.getElementById('import-file').click();
document.getElementById('import-file').onchange = (e) => {
const file = e.target.files[0];
if (file) {
const reader = new FileReader();
reader.onload = (ev) => channelManager.importBlocked(ev.target.result);
reader.readAsText(file);
}
};
},
updateBlockedList() {
const list = document.getElementById('blocked-list');
const count = document.getElementById('blocked-count');
if (!list) return;
if (count) count.textContent = `Total: ${state.blockedChannels.length}`;
list.innerHTML = state.blockedChannels.length === 0
? '<p style="color: #aaa; text-align: center; padding: 20px;">No blocked channels</p>'
: state.blockedChannels.map(ch => `
<div style="display: flex; justify-content: space-between; align-items: center; padding: 10px; margin-bottom: 6px; background: #3a3a3a; border-radius: 6px;">
<span style="flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;" title="${ch}">${ch}</span>
<button onclick="window.unblockChannelFromPanel('${ch.replace(/'/g, "\\'")}'))" style="background: #065fd4; color: white; border: none; padding: 6px 12px; border-radius: 4px; cursor: pointer; font-size: 12px; margin-left: 8px;">Unblock</button>
</div>
`).join('');
},
makeDraggable(el) {
let pos1=0, pos2=0, pos3=0, pos4=0;
el.onmousedown = (e) => {
pos3 = e.clientX;
pos4 = e.clientY;
el.style.cursor = 'grabbing';
document.onmouseup = () => {
document.onmouseup = null;
document.onmousemove = null;
el.style.cursor = 'grab';
};
document.onmousemove = (e) => {
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
el.style.top = (el.offsetTop - pos2) + "px";
el.style.left = (el.offsetLeft - pos1) + "px";
el.style.right = 'auto';
};
};
}
};
// Global function for panel
window.unblockChannelFromPanel = (ch) => {
if (channelManager.unblock(ch)) {
alert(`✅ Unblocked: ${ch}`);
ui.updateBlockedList();
location.reload();
}
};
// Optimized main processing with debouncing
const debouncedProcess = utils.debounce(() => {
if (state.isProcessing) return;
state.isProcessing = true;
try {
videoProcessor.mark();
videoProcessor.addBlockButtons();
videoProcessor.addBadges();
channelPage.addButton();
} finally {
state.isProcessing = false;
}
}, CONFIG.DEBOUNCE_DELAY);
function processPage() {
debouncedProcess();
}
// URL change detection with optimization
function detectUrlChange() {
if (location.href !== state.lastUrl) {
state.lastUrl = location.href;
setTimeout(() => {
styles.inject();
processPage();
}, CONFIG.INIT_DELAY);
}
}
// Initialize with performance monitoring
setTimeout(() => {
console.log('🚫 YouTube Channel Blocker v5 initialized');
console.log(`📊 Blocking ${state.blockedChannels.length} channels`);
console.log('✨ NEW: Enhanced fullscreen mode with scroll prevention');
ui.createToggleButton();
ui.createManagementPanel();
styles.inject();
processPage();
// Initialize fullscreen detection
fullscreenHandler.handleFullscreenChange();
}, CONFIG.INIT_DELAY);
// Optimized intervals
setInterval(processPage, CONFIG.PROCESS_INTERVAL);
setInterval(detectUrlChange, CONFIG.URL_CHECK_INTERVAL);
// Listen for fullscreen changes - ENHANCED IN v5
document.addEventListener('fullscreenchange', () => fullscreenHandler.handleFullscreenChange());
document.addEventListener('webkitfullscreenchange', () => fullscreenHandler.handleFullscreenChange());
document.addEventListener('mozfullscreenchange', () => fullscreenHandler.handleFullscreenChange());
document.addEventListener('MSFullscreenChange', () => fullscreenHandler.handleFullscreenChange());
// Also check for YouTube's custom fullscreen class changes
const fullscreenObserver = new MutationObserver(() => fullscreenHandler.handleFullscreenChange());
setTimeout(() => {
const videoPlayer = document.querySelector('.html5-video-player');
if (videoPlayer) {
fullscreenObserver.observe(videoPlayer, { attributes: true, attributeFilter: ['class'] });
}
}, 1000);
// Performance monitoring
if (state.blockedChannels.length > 0) {
console.log('✅ YouTube Channel Blocker v5 active with enhanced fullscreen control');
}
})();