Over 40 Malicious Firefox Extensions Exposed – A Warning for Crypto Users
Introduction
In recent months, more than 40 malicious Firefox extensions targeted users of popular crypto wallets such as MetaMask, Coinbase, and Trust Wallet. These fake add-ons aim to trick users and steal private keys, passwords, and seed phrases. As the crypto market continues to grow, so do the threats.
How They Work
First, the extensions mimic the look and behavior of real wallets. Then, they use fake five-star reviews to appear trustworthy. Once users install them, these extensions silently collect sensitive data and send it to the attackers.
Notably, this attack campaign started in April 2025 and is still ongoing. As a result, many users may have already been affected.
Who Is Behind It
Experts believe the attack came from a professional group, possibly located in Eastern Europe. They used advanced techniques, including copied open-source code, to build these dangerous extensions. Therefore, tracing the exact source remains difficult.
Why It’s Dangerous
These extensions can lead to instant theft of crypto funds. Since they passed Firefox’s review process, many users trusted them without hesitation. Additionally, some victims reported losing access to their entire wallets after installing just one extension.
Clearly, the risk is real and growing.
How to Protect Yourself
To stay safe, follow these steps:
- Install extensions only from official sources.
- Check reviews carefully. Real user feedback often includes details—look for that.
- Pay attention to permissions. Be cautious if an extension asks for full access.
- Review installed extensions regularly. Remove anything suspicious.
- Use security tools. Privacy-focused browser add-ons can help block threats.
By taking these actions, you reduce the risk of falling victim.
What Firefox Can Improve
Going forward, Firefox needs to strengthen its approval process. For example, it should automatically scan for suspicious code and warn users when an extension requests sensitive access.
Moreover, adding a verification badge for trusted developers would help users make safer choices.
Conclusion
The discovery of over 40 malicious Firefox extensions is a serious warning. Cybercriminals are becoming smarter, but users can stay ahead by being careful, informed, and proactive. Don’t let your digital assets fall into the wrong hands—always verify before you install.
