ShieldSign by SingeQuantique
**Protect your passwords at a glance.** ShieldSign displays a trust banner on your real login pages to make phishing instantly visible. Free, open-source, no data leaves your browser.
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About this extension
🛡️ ShieldSign — The simplest way to know where you can enter your password
Knowing if a login page is real or fake should be obvious.
Today, it's no longer the case: phishing pages have become indistinguishable to the naked eye.
ShieldSign solves this problem.
The extension automatically validates safe login pages and displays a clear, visible banner that's impossible to imitate.
If ShieldSign doesn't confirm the page, don't type your password.
🎯 Why is this really useful?
Because today we get tricked not by carelessness, but because a fake site can be perfectly identical to the real one.
The only important question becomes:
👉 "Can I type my password here?"
With ShieldSign, the answer is visual, immediate and reliable.
✨ What ShieldSign does for you
✔️ Automatically identifies login pages
As soon as a site contains a password field, ShieldSign checks the domain.
✔️ Displays an impossible to imitate validation banner
3 security modes:
An attacker cannot reproduce this code or keyword.
Even a perfect copy of the page will be unmasked in a second.
✔️ Works with lists: community, personal, enterprise
✔️ Automatically adds your legitimate sites
Every time you log in to a new site, ShieldSign can offer to save it.
You have nothing to manage: the extension learns with you.
✔️ 100% local, 100% private
🔒 Why is it safer than an HTTPS padlock?
Because all modern phishing sites also have a padlock.
Because "looking at the URL" is no longer realistic: tired, rushed, stressed... humans get tricked.
ShieldSign gives you an external visual marker, safe, constant, reliable.
You no longer wonder:
🎨 Simple, customizable, designed for everyday use
🏢 For businesses
ShieldSign allows organizations to:
🧭 Why choose ShieldSign?
Because it's:
ShieldSign doesn't replace your vigilance, but it removes uncertainty — which is precisely what attackers are looking for.
You'll finally know where you can enter your password, stress-free.
BULLET POINTS ("Features")
Knowing if a login page is real or fake should be obvious.
Today, it's no longer the case: phishing pages have become indistinguishable to the naked eye.
ShieldSign solves this problem.
The extension automatically validates safe login pages and displays a clear, visible banner that's impossible to imitate.
If ShieldSign doesn't confirm the page, don't type your password.
🎯 Why is this really useful?
Because today we get tricked not by carelessness, but because a fake site can be perfectly identical to the real one.
The only important question becomes:
👉 "Can I type my password here?"
With ShieldSign, the answer is visual, immediate and reliable.
✨ What ShieldSign does for you
✔️ Automatically identifies login pages
As soon as a site contains a password field, ShieldSign checks the domain.
✔️ Displays an impossible to imitate validation banner
3 security modes:
- Discreet badge
- Personal keyword known only to you
- Random code changing with each visit (recommended)
An attacker cannot reproduce this code or keyword.
Even a perfect copy of the page will be unmasked in a second.
✔️ Works with lists: community, personal, enterprise
- A community list of trusted domains
- Your own favorite domains
- Enterprise option: a list pushed by your organization, to secure internal access
✔️ Automatically adds your legitimate sites
Every time you log in to a new site, ShieldSign can offer to save it.
You have nothing to manage: the extension learns with you.
✔️ 100% local, 100% private
- No data sent to a server.
- No tracking.
- The list of sites you use stays in your browser, only as URLs.
🔒 Why is it safer than an HTTPS padlock?
Because all modern phishing sites also have a padlock.
Because "looking at the URL" is no longer realistic: tired, rushed, stressed... humans get tricked.
ShieldSign gives you an external visual marker, safe, constant, reliable.
You no longer wonder:
"Is this the right site?"
You simply look:
Is the banner there? Then it's good.
🎨 Simple, customizable, designed for everyday use
- Customizable colors or gradients
- Multiple fonts
- Discreet badge or visible banner
- Automatic updates
- Clean, clear interface, no ads
🏢 For businesses
ShieldSign allows organizations to:
- push their official list of internal domains
- drastically reduce the risk of targeted phishing
- without backend, without cost, without infrastructure
- open-source and auditable
🧭 Why choose ShieldSign?
Because it's:
- Free
- Open-source
- Privacy-respecting
- Reliable
- Designed for humans, not just experts
ShieldSign doesn't replace your vigilance, but it removes uncertainty — which is precisely what attackers are looking for.
You'll finally know where you can enter your password, stress-free.
BULLET POINTS ("Features")
- Automatic detection of login pages
- Impossible to imitate validation banner
- 3 security modes: badge, keyword, random code
- Community lists + personal list
- Enterprise mode (managed lists)
- Automatic addition of your sites
- No data transmitted – 100% local
- Open-source and free
- Full customization: colors, font, banner style
- Automatic updates of remote lists
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Permissions and data
Required permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.0.1
- Size
- 3.88 MB
- Last updated
- 2 days ago (Nov 20, 2025)
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- Version History
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The developer of this extension asks that you help support its continued development by making a small contribution.