Chrome Web StoreNo malware found
In code review (v2026.6)
Our reviewer read version 2026.6 — the most recent version we have reviewed — and found no malicious behaviour. The version shown here has not been individually reviewed yet.
What our analysis found
CheerpJ Applet Runner, used by 100,000 people, showed no malicious code in Extension Auditor's review. Its permissions mean it can inject scripts into pages. It comes from a trusted publisher and was last updated in September 2026.
Analyst notes
The CheerpJ Applet Runner is a legitimate extension that converts Java applets to All permissions are required for its core functionality. The only outbound network call is to the publisher’s own domain ([domain withheld]) for license validation, which is expected and disclosed. The large CheerpJ runtime files contain patterns (fetch, XHR, eval, innerHTML) that are typical of a complex emulator and likely caused the ML model to overreact, but no malicious behavior is present. The third-party risk assessment and publisher reputation corroborate a benign verdict.
CheerpJ Applet Runner Chrome extension security report
ID: bbmolahhldcbngedljfadjlognfaaein
Supported Languages
Extension Info & Metadata
Publisher Contextual Analysis
- Author
- Leaning Technologies Limited
- Privacy
- Privacy Policy
- Help
- Help Center
- MX records exist
- No
- Domain exists
- No
- Is disposable
- No
- Is role-based
- Yes
- Mailbox exists
- No
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Screenshots & videos
Install growth
About this extension
Run Java applets without installing Java
Read the publisher’s full description
CheerpJ Applet Runner - Run Java applets without installing Java With the CheerpJ Applet Runner extension, you can run legacy Java Applets on modern browsers without a Java plugin or a Java installation. Using the CheerpJ Applet Runner is simple. Just install and pin the extension. Next, visit your Applet-based website, click the extension icon in the upper-right corner of your browser, and then press the 'Enable' button in the popup. Once enabled, the extension is activated for the current domain, and Applets will start automatically if they are present. This extension works by 'converting' the Java Applet to WebAssembly and JavaScript on the fly. It is private and secure, runs fully client-side (i.e. it does not contact any server), and does not collect any data or analytics at all. All your data, as well as your application are kept within the boundaries of your browser. This extension, developed by Leaning Technologies, is based on CheerpJ, a JVM/JRE replacement for modern browsers. More information on CheerpJ are available at https://www.cheerpj.com. This software is free to use for non-business purposes on public-network Applets. For any other use, such as internal network applets, or if you are a company or public-sector organisation and would like to license CheerpJ, please get in touch with sales@leaningtech.com.
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Extension files
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No network indicators were extracted from this version.
Code Diff
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