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 Outdated or Abandoned Extensions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.
8 Ways to Protect Yourself from Browser Extension Threats
- Install from Trusted Sources Only
Use official platforms like the Chrome Web Store or Microsoft Edge Add-ons. These are monitored and more likely to flag dangerous extensions. - Review Extension Permissions
If an ad blocker asks to read your emails — that’s suspicious. Only allow what’s necessary for the tool to function. - Keep Extensions Updated
Updates often patch security flaws. If an extension hasn’t been updated in 6–12 months, it might be time to delete it. - Remove Unused Extensions
The more extensions you have, the more attack points you offer. Conduct a clean-up every few months. - Use Security Software
Modern antivirus programs can detect malicious browser activity and block threats at the source. - Educate Your Team
Train staff to recognise risky extensions, review permissions, and report suspicious behaviour. - Report Suspicious Extensions
Found a fake or shady tool? Report it to the extension marketplace and notify your IT team. - Conduct Regular Extension Audits
Set a calendar reminder to review your installed extensions quarterly. Clean, updated browsers are safer and faster.
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 hidden threats before they become a problem.
👉 Explore our cybersecurity services
📞 Book a free consultation and stay protected from browser extension security risks.
🔗 Inspired by:
Original article from The Technology Press
