Open source · Browser extension · Chrome, Edge and Firefox
Scouter Browser Defense: Stop the paste-this-command scam before it runs.
Scammers show you a fake "verify you are human" or "fix this error" page and tell you to copy a command and paste it into Terminal, PowerShell or the Windows Run box. That command installs malware — and you ran it yourself. Scouter Browser Defense catches it the instant the page copies the command, and throws an unmissable warning before you paste.
Signed Chrome Web Store and Firefox listings are on the way. For now it installs in developer mode — steps below.
What it catches
Three of the web's most common traps.
ClickFix commands
The moment a page copies a command-shaped payload to your clipboard, you get a loud warning and a one-click way to clear your clipboard — before you can paste it anywhere.
Fake-CAPTCHA lures
It flags the "verify you are human" and "fix this error" pages themselves, the lures that set the scam up in the first place.
Phishing logins
It warns you when a page asks for your password on an untrustworthy web address, so a look-alike site doesn't walk off with your credentials.
Private by design
It collects nothing.
There's no account, no sign-up and no servers. In standalone mode the extension makes no network requests at all. It inspects a page's clipboard write only to tell whether it looks like a command, in the page and never stored — and it never reads clipboard contents you copy yourself.
Read the privacy policyOptional power-up
Better with the agent.
If you run the open-source Scouter agent on your computer, you can pair the extension with it over localhost. A flagged site gets checked against live malware blocklists, and you can block it across your whole device with one click — reversibly.
About the Scouter agentInstall it
A few steps, until the stores go live.
Download the extension from GitHub, then load it in developer mode. Once the Chrome Web Store and Firefox listings are approved, it'll be a one-click install instead.
- Chrome, Edge or Brave: Open
chrome://extensions, turn on Developer mode, choose "Load unpacked," and select theextensionfolder. - Firefox: Build the Firefox package with the included
tools/pack.sh, then load it fromabout:debugging→ "Load Temporary Add-on." - The repository's
USAGE.mdhas the full walkthrough and a safe demo page to test it on.
Part of the open-source Scouter project.
Free, Apache 2.0, and built to protect your privacy — not to collect your data.