Tannu Jiwnani is a cybersecurity leader focused on incident response, IAM and threat detection, with a passion for resilience and community.
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In most organizations, the browser has become the operating system for work, and extensions are the plug-ins that can quietly reshape it. They deliver productivity gains: translation, meeting notes, workflow automation and AI assistance.
However, the same one-click install experience that makes extensions feel frictionless also makes them easy to misuse. "Add to browser" can be a decision that silently expands your attack surface for months.
In February 2026, BleepingComputer reported that researchers at LayerX found a coordinated campaign of malicious extensions called AiFrame that masqueraded as AI assistants. The set reached more than 300,000 users and was observed collecting credentials, browsing data and even email content. Users thought they were installing helpful tools but were actually authorizing code that could see and export what their browser could see.
This pattern is what worries me most. Extensions rarely feel like "software," so they often bypass the skepticism users apply to apps, downloads or links. Yet extensions can run with privileged access to sessions, pages and identity flows exactly where enterprises concentrate their most sensitive work. Learning to evaluate extensions before installing them is now a baseline hygiene skill, and for security teams, it needs to be treated as a governance problem rather than just a user choice.
Extensions run in the same place where we do our most valuable work: email, collaboration tools, cloud consoles and business applications. Once installed, they can read page content, observe activity and interact with web apps. These capabilities are powerful when used responsibly but risky when abused.
Attackers exploit the fact that malicious extensions can look identical to legitimate ones. They mimic AI assistants, translation tools, productivity apps and even security utilities, often building credibility through branding and install counts. According to BleepingComputer, fake AI extensions have been designed to capture webpage content, including sensitive data and email information.
Being in the official store doesn't necessarily mean an extension is safe.
The AI boom has become an effective delivery vehicle for browser based threats. Users want AI features everywhere, and an "AI sidebar" promising instant productivity is an easy sell with little installation friction.
Attackers exploit this demand by disguising malicious extensions as AI assistants or productivity tools. In the AiFrame campaign, the extensions didn't run AI locally. Instead, they loaded content from remote servers while collecting user data in the background. That architecture also allowed operators to change behavior server-side without shipping a new extension version for review.
As AI features become standard, we should expect "AI-branded" extensions to remain a high-confidence lure for attackers.
The permissions you grant define the capabilities of an extension. With the wrong permissions or the wrong publisher, an extension can behave like a surveillance and data-exfiltration agent inside your most trusted workflows.
OWASP Cheat sheet highlights that browser extensions can introduce serious security risks when they request excessive permissions, expose sensitive data or inject scripts into webpages. Vulnerabilities such as permission overreach, data leakage and code injection can allow extensions to access browsing activity, sensitive user information or modify webpage behavior and effectively turn everyday browsing into a potential attack path.
In the AiFrame campaign, a subset of extensions would read message content directly from the page and send it to attacker-controlled infrastructure. Because this happens inside the browser session, it can evade controls that focus only on the network perimeter.
Extensions can be useful, but leaders should evaluate them like any software with privileged access. A few quick checks can reduce much of the risk:
1. Excessive Permissions: If an extension asks to read or change data across all websites, treat it as a warning sign. Broad access is rarely necessary and increases risk.
2. Unknown Or Unverified Publishers: Verify who created the extension. Legitimate developers usually have a clear company identity, website and support channels.
3. Unclear Ownership Or Data Practices: If you can't quickly determine who owns the extension or how it handles user data, assume additional risk.
4. New Extensions With High Install Counts: Be cautious of recently released extensions that suddenly show large numbers of installs. Popularity can be artificially inflated.
5. Generic AI Or Productivity Claims: Vague descriptions focused on marketing rather than explaining permissions, data use or processing should raise concerns.
6. Suspicious Reviews: Use reviews as a signal. Multiple reports of pop-ups, broken pages, unexpected logouts or unusual data requests are good reasons to pause.
For enterprises, extensions create an uncomfortable gap between "shadow IT" and "privileged code." Employees install them to solve real problems, but those installs often happen outside of formal review, inventory and risk management.
Security teams should consider controls such as:
• Allow lists that restrict installs to approved extensions
• Browser security monitoring to detect suspicious extension behavior
• Targeted user education on extension specific risks
• Periodic reviews of installed extensions and their permissions
In identity-driven environments, this matters even more. Tokens, sessions and sensitive workflows increasingly live in the browser. If the browser session is compromised, attackers can gain access to cloud services, collaboration platforms and internal applications without "breaking in" the way defenders expect.
Most security failures aren't the result of one dramatic moment. They're the result of small, convenient choices repeated over time. Installing an extension takes seconds, but the access it gains can persist for months or years across every site and session you use.
The next time you see "add to browser," pause. A 30-second permissions check today can prevent an incident response tomorrow.
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