Learn how to assess the risks behind the permissions browser extensions request, and why it matters for security.

Why Permissions Matter in Browser Security

Browser extensions are powerful tools. They can streamline workflows, enhance productivity, and personalize the browser experience. But this power comes with risk, especially when extensions request excessive or overly intrusive permissions.

While some permissions are necessary to provide expected functionality, many extensions request far more access than needed. That’s why understanding extension permissions is key to detecting risky behavior before it becomes a breach.

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The Core Question: Is This Permission Justified?

When reviewing an extension, start by asking:
Does this extension actually need the permissions it’s requesting to do what it advertises?

If the answer is no, or unclear, that’s a red flag.

For example, Keep Aware recently flagged four PDF viewer extensions that requested access far beyond what’s needed for rendering a file. These extensions had permissions to:

• Change the browser’s default search provider
  
  
• Read and modify traffic to any website
  
  
• Manage all other installed extensions
  
  

None of these capabilities are required for viewing a PDF, but they are commonly used in malicious or manipulative browser behavior.

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High-Risk Extension Permissions to Watch

Here’s a breakdown of intrusive permissions that frequently indicate elevated risk:

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‍What Are Indicators of a Risky Extension?

Beyond permissions alone, keep an eye out for other signals of potentially malicious behavior:

• Excessive permissions not aligned with the advertised purpose
  
  
• Vague or missing descriptions of functionality
  
  
• Unremovable or locked extensions
  
  
• Generic names that mask intent (e.g., “File Helper” or “Tab Manager Pro”)
  
  
• No visible activity yet, high-level access
  
  

The Bottom Line: Permission Requests Are Security Signals

Excessive or unnecessary permissions aren’t just sloppy—they’re intentional design choices that create risk. Whether used for surveillance, manipulation, or lateral movement, these capabilities turn everyday browser tools into potential attack surfaces.

At Keep Aware, we help security teams detect and respond to these risks with real-time visibility into extension permissions, behaviors, and threat patterns across the browser.

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