Browser extension security risks are becoming more common as browser add-ons grow in popularity. With over 176,000 extensions available in the Chrome Web Store alone, it’s easy to see why they’re as widespread as mobile apps. People tend to install many, use a few, and rarely check what’s happening in the background.
While browser extensions offer convenience and customisation, they also present significant cybersecurity threats. From malware to data breaches, the risks of unsafe browser extensions can compromise both your personal privacy and business data.
In this article, we break down common browser extension threats, explain how they work, and offer expert tips to help you stay secure.
Why Browser Extensions Are Risky — and Still Popular
Browser extensions extend your browser’s functionality — think ad blockers, password managers, and productivity tools. They’re incredibly easy to install and often free.
But this convenience is exactly what makes them dangerous.
Without proper vetting, you might unknowingly install an unsafe browser extension that can:
- Steal login credentials
- Inject ads or track online behaviour
- Create fake login pages
- Slow down your system
Understanding these browser extension security risks is essential for any internet user — especially if you manage sensitive business data.
The Top Browser Extension Security Risks in 2025
🔒 1. Overreaching Permissions
Many extensions request broad access, such as reading all your web data or monitoring keystrokes. If granted, this opens the door to major privacy violations — often without your knowledge.
Tip: Always review permissions carefully before clicking “Add to Chrome”.
🛑 2. Malicious or Fake Extensions
Some extensions are deliberately designed to act as spyware or phishing tools. They might:
- Mimic legitimate brands
- Track browsing activity
- Install malware behind the scenes
Once installed, they’re difficult to spot and remove — especially if they look trustworthy.
⏳ 3. Outdated or Abandoned Extensions
Extensions that haven’t been updated in months (or years) may contain unpatched vulnerabilities. These can be exploited by cybercriminals to infiltrate your system.
Red flag: No recent updates or visible support from the developer.
🎭 4. Phishing and Fake Login Pages
Certain extensions display fake websites or pop-ups designed to capture usernames and passwords. They imitate trusted platforms like Microsoft 365, Gmail, or your bank.
Once you enter your credentials, they’re harvested for malicious use.
🐌 5. Slow Performance and System Instability
Poorly coded or bloated extensions can cause:
- Browser crashes
- Freezing or lag
- High memory usage
If your browser feels sluggish, it might not be your internet — it could be a rogue add-on.
When to Seek Professional Support
While individuals can take basic precautions, businesses — particularly those handling confidential or financial information — require a more strategic approach to browser security. Engaging a specialist in IT consulting on the Sunshine Coast helps ensure safe use of browser extensions, the implementation of secure browsing policies, and proactive threat monitoring.
These professionals conduct thorough security audits, provide real-time threat oversight, and recommend trusted tools to reduce risk and maintain system integrity.
8 Ways to Protect Yourself from Browser Extension Threats
Frequently Asked Questions About Browser Extensions
Why should I install browser extensions only from trusted sources?
Trusted platforms such as the Chrome Web Store and Microsoft Edge Add-ons regularly monitor their extensions for security issues. As a result, they are more likely to detect and remove malicious tools before they cause any harm.
Why is it important to review extension permissions?
Some extensions ask for excessive access, including your emails or full browsing history. These requests often signal a potential privacy risk. Therefore, always check what you’re granting and only approve the permissions required for the tool to work.
How often should I update my browser extensions?
You should update your browser extensions regularly. Most updates contain important security patches that prevent known vulnerabilities. If an extension hasn’t received updates in 6 to 12 months, it’s a good idea to remove it.
Why should I remove unused browser extensions?
Even when you’re not using them, extensions can still access your browser data. Consequently, having too many creates more opportunities for cyber threats. By removing unused tools, you reduce your risk and improve performance.
Can antivirus software protect against malicious browser extensions?
Yes, it can. Modern antivirus programs now include browser protection features. These tools actively monitor extension activity and block any suspicious behaviour before it affects your system.
Should I train staff about browser extension risks?
Absolutely. Your staff play a critical role in cybersecurity. When you train them to recognise risky extensions, assess permissions, and report issues, you strengthen your business’s first line of defence.
How do I report a suspicious browser extension?
You can report questionable extensions directly through the browser’s extension store. In addition, always inform your IT support team so they can investigate further and take appropriate action.
How often should I audit my browser extensions?
You should conduct a browser extension audit every three months. Regular audits help you maintain a clean, secure browsing environment by removing outdated or unsafe tools.
Final Thoughts: Take Browser Extension Risks Seriously
Browser extensions are just one piece of the cybersecurity puzzle. Others include phishing emails, weak passwords, and outdated software. But extensions are particularly sneaky because they often look harmless.
At Microsavvy, we help small businesses across the Sunshine Coast and Brisbane secure their digital environments, including browser-level vulnerabilities.
✅ Get a Free Browser Security Audit
Want peace of mind? Our team can assess your current browser setup and remove malicious browser extensions
👉 Explore our cybersecurity services
📞 Book a free cybersecurity consultation and stay protected from browser extension security risks.
🔗 Inspired by:
Original article from The Technology Press
