# AdOff — Universal Stealth Ad Blocker (Full Documentation)

> AdOff is a Manifest V3 browser extension (Chrome, Edge, Brave, Opera, Firefox, Safari) that blocks ads on every website while staying invisible to anti-adblock detection. It combines 180 network rules, native CSS hiding, a universal IMA SDK stub for video ad neutralization, and dedicated Stealth Mode anti-detection. Featherlight — a tiny fraction of the size of uBlock Origin and AdBlock Plus.

## Quick Facts

- **Version**: 3.6.10
- **Size**: featherlight, zero runtime dependencies
- **License Model**: 100% free for everyone (all features included)
- **Free use**: 30 days without account, then a free account (never a payment) continues for another 365 days
- **Languages**: 15 (English, Italian, German, French, Spanish, Portuguese, Russian, Arabic, Chinese, Hindi, Japanese, Korean, Turkish, Indonesian, Polish)
- **Data Collection**: Zero (no telemetry, no tracking, no user data)

## Core Technology

### Network Blocking (Layer 1)
- 180 declarativeNetRequest rules blocking ad networks, trackers, and video pre-roll endpoints
- IMA SDK requests blocked at network level
- Real-time ad request counter (badge displays only real ads, excludes 23 tracking/analytics rule IDs)
- Granular per-domain rules for targeted blocking

### Cosmetic Filtering (Layer 2)
- CSS-based hiding of ad slots, banners, paywalls, cookie walls, injected containers
- Content-isolated script (no MAIN world access) prevents code injection
- DOM scanning and mutation observer for dynamically injected ads
- Universal selectors work across 99% of websites

### Video Ad Neutralization (Layer 3)
- **Universal IMA SDK stub**: injected in MAIN world, works on any video player using Google IMA SDK
- When player calls `adsManager.start()`, stub fires `CONTENT_RESUME_REQUESTED` immediately
- Zero ads, fully functional player (no re-buffering, no quality drops)
- Works for externally-loaded IMA SDK (via redirect in Layer 1) and bundled IMA SDK in custom players
- Supports DASH, HLS, and progressive video streaming

### Stealth Mode Anti-Detection (Layer 4)
- MAIN-world script defeating anti-adblock systems
- **Bait spoofing**: fake ad slots that appear to block, hide detection triggers
- **Variable spoofing**: masks adblocker-detection variable names (replaces `.adsbygoogle`, `adslot`, etc.)
- **Fetch/XHR interception**: intercepts ad network calls before they fail, returns success responses
- **DOM mutation observation**: detects and prevents anti-adblock scripts from running
- Sites that detect uBlock Origin or AdBlock Plus do not detect AdOff
- Transparent to end user — zero configuration

### Whitelist (Per-Site Control)
- 4 pause modes:
  - **1 hour**: pause until next navigation
  - **1 day**: pause for 24 hours
  - **Until next visit**: pause permanently until manual re-enable
  - **Permanent**: always off on this site (saved to whitelist storage)
- Easy one-click toggle in popup
- Visual indicator in popup showing paused sites

### Counter & Badges
- **Real ads blocked**: cosmetic + video ads skipped (displayed in badge)
- **Network requests blocked**: tracked separately (not in badge, visible in options)
- **Excludes from count**: 23 rule IDs for Google Analytics, Facebook Pixel, Hotjar, Mixpanel, Segment, Amplitude, NewRelic, Sentry, Moat, DoubleVerify, IAS, ScoreCard, Quantserve, Twitter/TikTok analytics, Gemius, AddThis
- Reset available in Options → Statistics

## What Makes AdOff Different

5 proprietary technologies no other ad blocker has:

1. **Anti-SABR-backoff** — defeats Server-side Adaptive Bitrate ad-injection without quality loss
   - Problem: some platforms inject ads server-side and reduce quality to force ad revenue
   - Solution: AdOff monitors bitrate, forces quality reset when ads are injected
   - Result: no quality penalty even on platforms with aggressive monetization

2. **Content-position recovery** — preserves seek/playback state across stealth ad-skip
   - Problem: skipping video ads often resets playback position or loses buffered content
   - Solution: AdOff preserves `currentTime`, buffer state, and playback state during skip
   - Result: seamless playback, no re-buffering

3. **Universal IMA SDK stub** — works on any video player using Google IMA SDK
   - Covers all major streaming platforms and 10,000+ custom video websites
   - Not platform-specific like other blockers
   - One stub covers all IMA SDK players

4. **State-preserving instant skip** — skip without re-buffering or quality drop
   - Skip happens in milliseconds, not seconds
   - Quality maintained throughout skip
   - Playback position preserved exactly

5. **Integrated Stealth Mode** — anti-detection built-in, not a third-party module
   - No external dependencies
   - Tightly integrated with blocking layers
   - Less detectable surface (smaller code footprint)

## Pricing

AdOff is 100% free for everyone. All features included from day one (stealth mode, video ad neutralization). 30 days of free use, then a free account (never a payment) to continue for another 365 days.

## FAQ

### Compatibility & Installation
**Q: Which browsers does AdOff support?**
A: Chrome, Edge, Brave, Opera (all Chromium-based), Firefox, and Safari (macOS 16.4+).

**Q: Does AdOff work on mobile?**
A: iOS and Android versions are in development. Currently desktop/laptop only.

**Q: How do I install AdOff?**
A: Visit https://adoff.app/install for step-by-step guides for each browser.

### Features
**Q: Is AdOff really free?**
A: Yes — 100% free for everyone. All features included from day one (stealth mode, video ad neutralization). 30 days of free use, then a free account (never a payment) to continue for another 365 days.

**Q: How many ads does AdOff block?**
A: Varies by site. Average 30-50 ads per page. Heavy ad sites: 100+.

**Q: Does AdOff block video ads on streaming platforms?**
A: Yes — AdOff blocks video ads on all streaming platforms and TV services, for everyone. It uses a universal IMA SDK stub that fires `CONTENT_RESUME_REQUESTED` immediately — zero pre-roll, zero countdown, no quality loss.

**Q: Does the Stealth Mode work on all sites?**
A: Stealth Mode defeats 99% of anti-adblock detection. A few premium anti-adblock services (Admiral, Sourcepoint at highest tier) may still detect it, but no public list exists.

### Privacy & Security
**Q: Does AdOff collect my data?**
A: No. Zero data collection. No telemetry, no tracking, no remote logging.

**Q: Does AdOff track my browsing?**
A: No. No analytics, no telemetry, no tracking cookies, no remote logging.

**Q: Is AdOff safe to use?**
A: Yes. Code is auditable (open-source components available on GitHub). No remote code execution, no auto-updates, no sketchy permissions.

**Q: Is the free account required?**
A: Only after 30 days of use. A free account (email only, never a payment) grants another 365 days, renewable. No credit card, ever.

### Performance
**Q: Will AdOff slow down my browser?**
A: No. Featherlight footprint, minimal memory overhead, no constant scanning.

**Q: Can I disable AdOff on specific sites?**
A: Yes, via the whitelist in the popup (4 pause modes).

**Q: Does AdOff have a performance mode?**
A: Yes, in Options → Advanced: toggle "aggressive CSS matching" for battery optimization.

### Payments & Accounts
**Q: Does AdOff ever ask for payment?**
A: Never. There are no paid plans. All features are free for everyone.

**Q: What happens after 30 days?**
A: A free account (never a payment) continues your protection for another 365 days, renewable.

## System Requirements

### Chrome/Edge/Brave/Opera
- Chrome 88+, Edge 88+, Brave 1.30+, Opera 74+
- Windows 7+, macOS 10.13+, Linux (most distributions)
- Minimal disk space

### Firefox
- Firefox 110+
- Windows 7+, macOS 10.13+, Linux (most distributions)
- 145 KB disk space

### Safari
- Safari 16.4+ (macOS Ventura 13.0+)
- Intel and Apple Silicon Macs
- 148 KB disk space

## Documentation & Support

- [Homepage](https://adoff.app/): product overview, pricing, FAQ
- [How it works](https://adoff.app/how-it-works): technical deep-dive on the 4-layer architecture
- [Why AdOff is unique](https://adoff.app/unique-tech): the 5 differentiating technologies
- [Comparison: AdOff vs uBlock Origin](https://adoff.app/vs/ublock-origin)
- [Comparison: AdOff vs AdBlock Plus](https://adoff.app/vs/adblock-plus)
- [Comparison: AdOff vs AdGuard](https://adoff.app/vs/adguard)
- [Best ad blocker 2026](https://adoff.app/best-ad-blocker-2026)
- [Installation guide](https://adoff.app/install): step-by-step for all browsers
- [User community & support](https://adoff.app/community)
- [Press kit](https://adoff.app/press)
- [Pricing & licensing guide](https://adoff.app/license-guide)
- [Support form](https://adoff.app/support): anti-bot, captcha-protected

## Languages

Full UI translation in 15 languages:

- **European**: English, Italian, German, French, Spanish, Portuguese
- **Eastern European**: Russian, Polish
- **Middle East/Asia**: Arabic, Chinese (Simplified)
- **South/East Asia**: Hindi, Japanese, Korean
- **Southeast Asia**: Turkish, Indonesian

## Legal & Compliance

- [Privacy Policy](https://adoff.app/privacy): zero tracking, GDPR-compliant, explicit CCPA disclosure
- [Terms of Service](https://adoff.app/terms): usage rights, limitations, liability disclaimers
- [Right of Withdrawal (EU)](https://adoff.app/withdrawal): 14-day cooling-off + 30-day refund guarantee
- [Trademark & Brand Guidelines](https://adoff.app/brand): use of AdOff name in comparisons and reviews

## Contact & Support

- **Support Form**: https://adoff.app/support (anti-bot, rate-limited)
- **Email**: Contact via form only (no direct email to prevent spam exposure)
- **Response Time**: 24-48 hours typical

## Distribution

- **Chrome Web Store**: under review
- **Microsoft Edge Add-ons**: under review
- **Mozilla Add-ons (Firefox)**: under review
- **Mac App Store (Safari)**: under review
- **Direct Download**: https://adoff.app/install (always latest version)