uBlock Origin

AI Security Review

Evidence context: threat category none; evidence quality strong.

Raymond Hill develops uBlock Origin, a legitimate, widely used open-source content blocker. Version 1.74.0 on the Firefox Add-ons store has over 10 million users. The code contains no suspicious domain, no permission finding, no secret, no token, no credential, and no cookie. No suspicious endpoint is present. No malware signature is present. No obfuscated code is present. No code-smell issue is present. No dependency vulnerability is present. This clean result matches the extension's reputation and the developer's long history of transparent, privacy-focused work. The code has been available for public inspection for years, and no one has found a problem. The large user base adds confidence. The extension has a long history of transparent development. The code is clean.

The extension's core function is to filter network requests. It blocks advertisements. It also blocks trackers and malicious content. This requires broad permissions, including access to all websites and the ability to modify web requests. The extension needs these permissions to inspect every request and decide what to block. Without them, the extension could not function as a content blocker. The extension must see every request to decide whether to block it. This is the core mechanism of a content blocker. A skeptic might argue that such permissions allow data exfiltration or code injection if misused. The absence of suspicious code patterns and the open-source nature of the project address that concern. Years of community auditing add further assurance. Raymond Hill has maintained the extension as its original author without any reported security incident. The high user count and active development further support its legitimacy. The extension's reputation is well established and consistently positive. The permissions are broad, but the code shows no attempt to misuse the permissions.

No specific file path or code snippet contains a problematic pattern. No false positive was suppressed.

The extension simply does not contain the types of patterns that trigger security findings. The absence of findings reflects clean code and does not represent a gap in the analysis. The absence of findings is a positive sign. The description accurately reflects the purpose, and the version number matches the current release. The code does what it claims to do. It is straightforward and easy to audit.

The extension is safe to install. Its broad capabilities are inherent to content blocking. Content blocking requires these broad permissions, and they do not indicate hidden intent. The evidence shows no sign of malicious behavior. Users can install it with confidence. The code is completely clean. No hidden behavior exists. The extension has a long track record of safe operation.

Key Reasons

• Zero findings across all security categories (no malware signatures, IoCs, network findings, obfuscation, code-smell, secrets, or dependencies)
• Developer is Raymond Hill, the original author of uBlock Origin with a long-standing reputation
• Extension description accurately describes a content blocker and matches its known purpose
• Version 1.74.0 is a current release and the extension has over 10 million users

Reviewed 2026-09-06; recommended action: no action; model confidence 95%.