Open-source · GPLv3 licensed · Zero telemetry · Firefox
ScriptGuard is a free privacy extension for Firefox that works as a script blocker, anti-tracking tool and network-layer ad blocker in one lightweight add-on. It deletes tracking scripts before they run, kills WebRTC IP leaks, deletes fingerprint requests, and strips tracking URLs — while keeping websites usable. See the four privacy modes and the full feature list below.
Every cluster below is a real problem ScriptGuard solves. Click a mode to see how.
Script & tracker control
Fingerprint protection
IP-leak & network defense
ScriptGuard works on any Firefox — desktop or laptop — in every country. Popular searches by region:
GEO note: the built-in Global Privacy Control (GPC) signal is recognized under CCPA/CPRA (California), Colorado, Connecticut and other US state laws, and supports GDPR/UK-GDPR conscious browsing — it tells every site you visit: “Do not sell or share my personal information.”
You decide the trade-off between privacy and usability — then explore every feature in detail. Try it:
Remembered rules + your regex rules — plus the ad & tracker firewall and tracking-URL stripping in every mode.
ScriptGuard hooks Firefox at document_start and deletes tracking and advertising scripts
before a single line executes. A backup sweep catches dynamically injected scripts, and the
heuristic engine learns suspicious scripts per site (WebRTC probing, fingerprinting, beacons, cookie access).
Honest limit: no extension can hide your public IP — pair ScriptGuard with a VPN or Tor for that.
Problem trackers load and fingerprint your device the instant a page opens — ad blockers arrive too late.
Solution ScriptGuard deletes the scripts before execution and blocks fingerprint requests.
Benefit you are untracked from the first millisecond, not after the fact.
Problem WebRTC quietly leaks your real IP even behind a VPN.
Solution the WebRTC kill-switch makes RTCPeerConnection throw — no STUN/ICE escape.
Benefit your VPN’s anonymity holds, and paired with Tor your circuit stays intact.
Problem heavy blockers break half the web and you disable them constantly.
Solution PRO mode deletes only third-party junk; whitelists rescue anything in one click.
Benefit strong privacy that you never need to switch off.
Problem “private” extensions secretly phone home.
Solution ScriptGuard makes zero background requests — auditable GPLv3 code proves it.
Benefit the privacy tool itself can never become the leak.
Questions left? Read the answers to common questions or compare ScriptGuard with other blockers.
An honest comparison — ScriptGuard is designed to stack with your ad blocker, not replace it.
| Capability | ScriptGuard | uBlock Origin | NoScript | Privacy Badger |
|---|---|---|---|---|
| Deletes scripts before execution | ✓ core engine | filter-based | ✓ (permission gates) | ✗ |
| Network-layer ad blocker | ✓ built-in | ✓ filter lists | ✗ | tracker-only |
| Canvas / WebGL / audio fingerprint spoofing | ✓ session-stable | partial | ✗ | partial |
| WebRTC local-IP leak prevention | ✓ kill-switch | ✗ | ✗ | ✗ |
| Tracking-URL stripping (utm_*, fbclid…) | ✓ built-in | filter-dependent | ✗ | ✗ |
| Global Privacy Control signal | ✓ headers + JS | ✗ | ✗ | ✓ |
| Escalation modes incl. nuclear | ✓ 4 modes | ✗ | levels | ✗ |
| Heuristic per-site learning | ✓ auditable | community lists | ✗ | ✓ |
| Zero telemetry | ✓ | ✓ | ✓ | ✓ |
| License | GPLv3 | GPLv3 | GPLv2 | AGPLv3 |
ScriptGuard is a free, open-source Firefox privacy extension that deletes tracking and advertising scripts before they execute, blocks WebRTC and Blob IP leaks, removes fingerprint requests (canvas, WebGL, audio), and adds a network-layer ad & tracker firewall. It works in four modes: OFF, BASIC, PRO and MAXIMUM.
Yes. ScriptGuard is 100% free and GPLv3 licensed. Every line of code is public on GitHub, there are no accounts, no premium tiers and zero telemetry. You can audit the source or build it yourself.
Yes. The ad & tracker firewall cancels requests to known advertising and tracking domains before anything is downloaded, in every active mode (BASIC, PRO and MAXIMUM). It also removes ad iframes and images from the page so empty ad boxes collapse.
uBlock Origin filters requests with filter lists; NoScript toggles script permissions. ScriptGuard goes further: it deletes scripts from the DOM before execution, spoofs canvas/WebGL/audio fingerprinting with session-stable noise, kills WebRTC IP leaks, strips tracking URLs like utm_* and fbclid, and sends Global Privacy Control signals. It is designed to stack alongside an ad blocker, not replace it.
No — and no browser extension can. ScriptGuard blocks browser-level IP leaks (WebRTC/STUN/ICE, blob workers, fingerprint-based inference), but hiding your public IP requires a VPN or Tor. ScriptGuard is fully compatible with both.
In BASIC and PRO modes, sites stay usable: PRO deletes third-party scripts and ads while first-party content keeps working, and whitelists rescue anything in one click. MAXIMUM mode is intentionally nuclear — it deletes every script and will break most sites by design. You choose the trade-off per site.
One click: open ScriptGuard on addons.mozilla.org and click Add to Firefox. Developers can also clone the GitHub repository and load it via about:debugging → This Firefox → Load Temporary Add-on.
No. ScriptGuard has zero telemetry, makes zero background requests and stores all rules locally in your browser. It also sends Global Privacy Control (GPC) and DNT signals telling websites not to sell or share your data.
Fingerprinting is a tracking technique where scripts read tiny hardware-specific differences (canvas rendering, WebGL renderer strings, audio processing) to build a unique ID for your device — no cookies needed. ScriptGuard spoofs these readings with session-stable noise in PRO mode and deletes them entirely in MAXIMUM mode, so your device cannot be re-identified across sessions.
Yes. ScriptGuard has a per-site whitelist, a global whitelist, user regex rules and heuristic learning rules — all exportable and importable as JSON, so you can back up or share your rule set.
Yes. ScriptGuard works worldwide on any Firefox browser. Its Global Privacy Control signal is recognized under US state privacy laws like CCPA/CPRA in the United States, and supports GDPR-conscious browsing in the EU and UK. All features work regardless of region — no geo-restrictions.
ScriptGuard is maintained by TuffyCoder and shared across a public community on YouTube, Reddit, TikTok and GitHub. No company, no data broker, no hidden funding — just readable code anyone can verify line by line.
Read how ScriptGuard works or follow the development journey.
ScriptGuard is built in the open — releases, upcoming features, privacy tips and behind-the-scenes land on social first. Pick your platform and come along:
Install ScriptGuard free, browse in BASIC, flip to PRO when you want real privacy, and keep MAXIMUM in your back pocket for the sites you do not trust an inch.
Already using ScriptGuard? Leave your review or feedback on Reddit — every message is read and shapes the next release.
