UltraBlock - Ultimate AdBlocker by arena tech

UltraBlock Pro - The Ultimate Lightweight AdBlocker for Firefox

Tired of unskippable YouTube ads, annoying popups, cookie banners, and sponsored posts? UltraBlock Pro removes them all - instantly.

55KB, 0 trackers, 0 data collection, 100% local blocking. Built for Manifest V2 power that Chrome extensions can never match.

▶ YOUTUBE - 100% AD-FREE (4-Layer Engine)
Other adblockers fail when YouTube updates. We use 4 layers so you never see an ad:

Network Block: Cancels youtube.com/api/stats/ads, doubleclick.net, googlesyndication.com before they load
API Interception: Intercepts youtubei/v1/player JSON and strips adPlacements[], playerAds[], adBreaks[] - player never sees ads
Auto-Skip: 400ms loop detects .ad-showing and seeks video to end + auto-clicks Skip button - no 5 sec wait
Cosmetic: Removes ytd-ad-slot-renderer, #masthead-ad, sponsored feed items
Result: No pre-roll, mid-roll, post-roll, overlay, banner, in-feed Sponsored, Shorts ads. Video starts instantly.

Pro YouTube Extras:

Press S to skip sponsor segments (+10s) - SponsorBlock-like
Hide YouTube Shorts shelf & sidebar
Hide Mixes & auto-playlists
Auto HD - forces highest quality
Cleans ?si= tracking from shared YouTube links
🛡 BLOCKS EVERYTHING, EVERYWHERE
Ads: Google Ads, DoubleClick, Taboola, Outbrain, 100+ networks
Video & Audio Ads: SpotX, Teads, FreeWheel, JWPlayer
Popups & Popunders: Advanced window.open blocker - only allows popups after real user click (1.5s gesture check). Blocks popads, propellerads, adsterra
Banners, Image, Text, Sticky, Floating Ads: 500+ cosmetic filters + MutationObserver
Facebook, Instagram, Twitch, TikTok: Hides Sponsored posts, promoted reels, ad overlays
Trackers: Google Analytics, Facebook Pixel, Hotjar, Mixpanel, Clarity
Crypto Miners: CoinHive, CryptoLoot, CoinImp, WebMinePool
Fingerprinting & Canvas Tracking
Tracking URLs: Auto-removes utm_source, fbclid, gclid, igshid - you copy clean links
🍪 COOKIE BANNER AUTO-BLOCKER (NEW)
Blocks OneTrust, CookieBot, Usercentrics, Didomi, TrustE, Quantcast (50+ selectors). Auto-clicks "Reject All / Necessary Only" and fixes scroll lock. Popup has "Clear Banners" button.

🎯 ELEMENT PICKER - BLOCK ANYTHING FOREVER (NEW)
Annoying newsletter, sticky header, chat widget, or ad that slipped through?

Press Ctrl+Shift+E or Right-click → Pick element to block
Hover - red overlay shows exact element + selector
Click - hidden permanently on that domain forever
Manage in Dashboard → Custom Filters
🤍 WHITELIST PER SITE (NEW)
Support your favorite creator or site breaks?

Click icon → Whitelist Site
Right-click → Disable on this site
Keyboard Ctrl+Shift+B
Manage all whitelisted domains in Dashboard
📊 PRO DASHBOARD & PRIVACY FIRST
Options page with stats: Total blocked, Data saved (MB), Time saved, Trackers blocked
Tabs: General, YouTube Pro, Whitelist, Custom Filters, Advanced, About
Custom filter editor: Add selector@domain like #annoying-popup@news.com
Export/Import backup as JSON - share filter sets with friends
Context menus + shortcuts: Ctrl+Shift+U/E/B
Why UltraBlock is faster & better than uBlock Origin / AdGuard:

YouTube API stripping is unique - not just cosmetic hiding
Built-in element picker with permanent storage per domain (no extra extension)
Cookie banner auto-reject, not just hide
URL cleaner - others don't clean tracking params
55KB vs 5MB+ - loads instantly, <1% CPU, pages load 30-50% faster
No external filter list download - all built-in, works offline⌨ SHORTCUTS
Ctrl+Shift+U: Open popup
Ctrl+Shift+B: Toggle current site whitelist
Ctrl+Shift+E: Element picker
S (on YouTube): Skip 10s sponsor segment
🆕 What's new in v2.0?
Whitelist per site + site status in popup
Element picker with visual overlay & permanent storage
Cookie banner blocker (50+ patterns) + auto Reject All
Tracker, crypto miner, fingerprinting blocker
Social ads blocker (FB/IG/Twitch/TikTok)
YouTube: Sponsor skip S key, hide Shorts/Mixes, Auto HD, ?si cleaner
URL tracker cleaner (utm_, fbclid)
Full Dashboard with Export/Import, Custom Filters editor
Data saved & time saved stats
Install now and experience the clean, fast web you deserve. YouTube starts instantly, news sites without clutter, no popups, no cookie nagging.

Support: Open Dashboard → Support or GitHub issues.