Stop Form Data From Leaking to the Wrong Sites
FormGuard intercepts every form submission, validates the target domain against your whitelist, and blocks suspicious requests before your data ever leaves the browser.
Get FormGuard — $9/moCancel anytime. Instant access after payment.
Intercept & Block
Content script hooks into every form submit event before data is sent.
Domain Whitelist
Define trusted domains and regex patterns via the dashboard.
Confirmation Dialog
Suspicious submissions prompt the user instead of silently failing.
Simple Pricing
Pro
$9
per month
- ✓ Chrome & Firefox extension
- ✓ Unlimited domain rules
- ✓ Dashboard configuration UI
- ✓ Background service worker
- ✓ Email support
FAQ
How does FormGuard detect suspicious submissions?+
The content script intercepts the form's submit event, extracts the action URL, and checks it against your configured whitelist. If no match is found, the submission is paused and you're shown a confirmation dialog.
Which browsers are supported?+
FormGuard supports Chrome (Manifest V3) and Firefox (Manifest V2/V3). Edge and Brave are also compatible since they share the Chromium extension API.
Is my form data sent to your servers?+
No. All validation happens locally inside the browser extension. Your form data never leaves your machine — only domain rule configurations are synced via the dashboard.