Is Duolingo Max safe to use?

Duolingo Max has a security risk score of 84.86/100 (HIGH risk). Our security analysis detected 101 findings. Review the detailed security assessment below to understand the specific risks before installation.

What are the security risks of Duolingo Max?

Based on our automated security analysis, Duolingo Max presents high risk level. The extension is analyzed for malware patterns, secret exposure, network communications, permissions, and supply chain vulnerabilities.

How is the security score calculated?

Risky Plugins calculates security scores using weighted categories: severity of findings (25 points max), malware detections (35 points), secret exposure (28 points), network communications (10 points), and obfuscation (10 points). Scores range from 0-100, with higher scores indicating greater risk.

What does CRITICAL, HIGH, MEDIUM, LOW, MINIMAL risk mean?

CRITICAL (80-100): Severe security issues like malware. HIGH (60-79): Significant vulnerabilities. MEDIUM (40-59): Moderate security concerns. LOW (20-39): Minor issues. MINIMAL (0-19): Very low risk. Always review findings before installing any extension.

Is "Duolingo Max" on Firefox Add-ons Safe to Install?

Name: Duolingo Max
Availability: InStock
Rating: 5 (22 reviews)
Author: apersongithub

apersongithub · firefox · v3.5

Previously Known As: Duolingo Unlimited Hearts Source: https://github.com/apersongithub/Duolingo-Unlimited-Hearts Features: - In Duolingo: No Ads, Unlimited Hearts, Personalized Practice, Free entry to Legendary levels - In Extension: Multiple and customizable patches for Duolingo Max, Super, and Unlimited Hearts, see amount of money you've saved per month Want speaking practices? Check out: Speech Recognition Polyfill Add-on or Speech Recognition Polyfill Userscript ❗Please rate the extension especially if it works for you (Read the FAQ too)❗ *Not affiliated with Duolingo

Risk Assessment

Analyzed

84.86

out of 100

HIGH

101 security findings detected across all analyzers

Firefox extension requesting 7 permissions

Severity Breakdown

Critical

High

Medium

Low

Info

Finding Categories

Malware Signatures

Obfuscation

Network

IoC Indicators

YARA Rules Matched

6 rules(32 hits)

LocalStorageShouldNotBeUsed postinstall file manipulation postinstall file download postinstall system command postinstall network communication postinstall persistence mechanism

Requested Permissions

7 permissions

webRequest

Intercept, modify, and block all network requests

High

webRequestBlocking

Block network requests before they complete

High

storage

Low

https://d35aaqx5ub95lt.cloudfront.net/*

Low

https://*.duolingo.com/*

Low

https://*.duolingo.cn/*

Low

https://raw.githubusercontent.com/*

Low

About This Extension

Previously Known As: Duolingo Unlimited Hearts Source: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/37a0887013aeb923df45d169488353d9b28e8c3c7df28d86dac1cd444634e2a0/https%3A//github.com/apersongithub/Duolingo-Unlimited-Hearts" rel="nofollow">https://github.com/apersongithub/Duolingo-Unlimited-Hearts</a> Features: - In Duolingo: <em>No Ads, Unlimited Hearts, Personalized Practice, Free entry to Legendary levels</em> - In Extension: <em>Multiple and customizable patches for Duolingo Max, Super, and Unlimited Hearts, see amount of money you've saved per month</em> Want speaking practices? Check out: <a href="https://addons.mozilla.org/en-US/firefox/addon/speech-recognition-polyfill/" rel="nofollow">Speech Recognition Polyfill Add-on</a> or <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/a990f5177d19f5c7047476b1038c39c8fbec9e83aa666bf04ba27aca667b5ddf/https%3A//greasyfork.org/en/scripts/568183-speech-recognition-polyfill-userscript/" rel="nofollow">Speech Recognition Polyfill Userscript</a> ❗Please rate the extension especially if it works for you (Read the FAQ too)❗ *Not affiliated with Duolingo

Detailed Findings

39 total

YARA Rule Matches

6 rules

Indicators of Compromise

Network indicators, suspicious strings, and potential IoCs extracted during analysis

URLs

IP Addresses

Domains

Strings

All Indicators · 60

URL

detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html',

XIOC detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html',

extracted_from_files

Domain

detected Domain: attr.name

XIOC detected Domain: attr.name

extracted_from_files

Hash

detected MD5 Hash: fa8debbce8d3e515c3b08cb10271fbee

XIOC detected MD5 Hash: fa8debbce8d3e515c3b08cb10271fbee

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/issues

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/issues

extracted_from_files

URL

detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extension-version.json');

XIOC detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extension-version.json');

extracted_from_files

URL

detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/max/9f30dad6d7cc6723deeb2bd9e2f85dd8.svg

XIOC detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/max/9f30dad6d7cc6723deeb2bd9e2f85dd8.svg

extracted_from_files

URL

detected URL: https://tampermonkey.net/

XIOC detected URL: https://tampermonkey.net/

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/raw/refs/heads/main/userscript/Duolingo%20Max.user.js

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/raw/refs/heads/main/userscript/Duolingo%20Max.user.js

extracted_from_files

URL

detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/hearts/fa8debbce8d3e515c3b08cb10271fbee.svg

XIOC detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/hearts/fa8debbce8d3e515c3b08cb10271fbee.svg

extracted_from_files

URL

detected URL: http://www.w3.org/2000/svg

XIOC detected URL: http://www.w3.org/2000/svg

extracted_from_files

URL

detected URL: https://d35aaqx5ub95lt.cloudfront.net/*

XIOC detected URL: https://d35aaqx5ub95lt.cloudfront.net/*

extracted_from_files

URL

detected URL: https://*.duolingo.com/*

XIOC detected URL: https://*.duolingo.com/*

extracted_from_files

URL

detected URL: https://*.duolingo.cn/*

XIOC detected URL: https://*.duolingo.cn/*

extracted_from_files

URL

detected URL: https://raw.githubusercontent.com/*

XIOC detected URL: https://raw.githubusercontent.com/*

extracted_from_files

URL

detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html'

XIOC detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html'

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/';

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/';

extracted_from_files

URL

detected URL: https://github.com/apersongithub

XIOC detected URL: https://github.com/apersongithub

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/tree/main',

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/tree/main',

extracted_from_files

URL

detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/max/9f30dad6d7cc6723deeb2bd9e2f85dd8.svg';

XIOC detected URL: https://d35aaqx5ub95lt.cloudfront.net/images/max/9f30dad6d7cc6723deeb2bd9e2f85dd8.svg';

extracted_from_files

Hash

detected MD5 Hash: c9af28107cd1d65ac2178589dc5a02ed

XIOC detected MD5 Hash: c9af28107cd1d65ac2178589dc5a02ed

extracted_from_files

Domain

detected Domain: originalxhropen.call

XIOC detected Domain: originalxhropen.call

extracted_from_files

Domain

detected Domain: parsedcache.data

XIOC detected Domain: parsedcache.data

extracted_from_files

Domain

detected Domain: data.health

XIOC detected Domain: data.health

extracted_from_files

URL

detected URL: http://addons.mozilla.org/ca/crl.pem0N

XIOC detected URL: http://addons.mozilla.org/ca/crl.pem0N

extracted_from_files

URL

detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extension-version.json';

XIOC detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extension-version.json';

extracted_from_files

URL

detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/icon.svg'

XIOC detected URL: https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/icon.svg'

extracted_from_files

URL

detected URL: https://github.com/apersongithub'

XIOC detected URL: https://github.com/apersongithub'

extracted_from_files

Domain

detected Domain: duolingo.com

XIOC detected Domain: duolingo.com

extracted_from_files

Domain

detected Domain: duolingo.cn

XIOC detected Domain: duolingo.cn

extracted_from_files

Domain

detected Domain: el.id

XIOC detected Domain: el.id

extracted_from_files

Domain

detected Domain: origappend.call

XIOC detected Domain: origappend.call

extracted_from_files

Domain

detected Domain: originsertbefore.call

XIOC detected Domain: originsertbefore.call

extracted_from_files

Domain

detected Domain: tampermonkey.net

XIOC detected Domain: tampermonkey.net

extracted_from_files

Domain

detected Domain: xmlhttprequest.prototype.open

XIOC detected Domain: xmlhttprequest.prototype.open

extracted_from_files

Domain

detected Domain: window.open

XIOC detected Domain: window.open

extracted_from_files

Domain

detected Domain: d35aaqx5ub95lt.cloudfront.net

XIOC detected Domain: d35aaqx5ub95lt.cloudfront.net

extracted_from_files

Domain

detected Domain: s.id

XIOC detected Domain: s.id

extracted_from_files

Domain

detected Domain: wrap.id

XIOC detected Domain: wrap.id

extracted_from_files

Domain

detected Domain: 渑m.ac

XIOC detected Domain: 渑m.ac

extracted_from_files

Domain

detected Domain: www.w3.org

XIOC detected Domain: www.w3.org

extracted_from_files

Domain

detected Domain: ev.data

XIOC detected Domain: ev.data

extracted_from_files

Domain

detected Domain: github.com

XIOC detected Domain: github.com

extracted_from_files

Domain

detected Domain: html-preview.github.io

XIOC detected Domain: html-preview.github.io

extracted_from_files

Domain

detected Domain: newli.id

XIOC detected Domain: newli.id

extracted_from_files

Domain

detected Domain: nodefilter.show

XIOC detected Domain: nodefilter.show

extracted_from_files

Hash

detected MD5 Hash: 9f30dad6d7cc6723deeb2bd9e2f85dd8

XIOC detected MD5 Hash: 9f30dad6d7cc6723deeb2bd9e2f85dd8

extracted_from_files

Domain

detected Domain: wrapper.id

XIOC detected Domain: wrapper.id

extracted_from_files

Domain

detected Domain: btnrow.style.gap

XIOC detected Domain: btnrow.style.gap

extracted_from_files

Domain

detected Domain: mozilla.com

XIOC detected Domain: mozilla.com

extracted_from_files

Domain

detected Domain: addons.mozilla.org

XIOC detected Domain: addons.mozilla.org

extracted_from_files

Domain

detected Domain: content-signature.mozilla.org

XIOC detected Domain: content-signature.mozilla.org

extracted_from_files

Domain

detected Domain: t86b0483d71f08a7526332f55407c978f.c9af28107cd1d65ac2178589dc5a02ed.addons.mozilla.org

XIOC detected Domain: t86b0483d71f08a7526332f55407c978f.c9af28107cd1d65ac2178589dc5a02ed.addons.mozilla.org

extracted_from_files

Domain

detected Domain: yrt.pn

XIOC detected Domain: yrt.pn

extracted_from_files

Domain

detected Domain: date.now

XIOC detected Domain: date.now

extracted_from_files

Domain

detected Domain: raw.githubusercontent.com

XIOC detected Domain: raw.githubusercontent.com

extracted_from_files

URL

detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/raw/refs/heads/main/userscript/Duolingo%20Unlimited%20Hearts.user.js

XIOC detected URL: https://github.com/apersongithub/Duolingo-Unlimited-Hearts/raw/refs/heads/main/userscript/Duolingo%20Unlimited%20Hearts.user.js

extracted_from_files

URL

detected URL: http://tampermonkey.net/

XIOC detected URL: http://tampermonkey.net/

extracted_from_files

Domain

detected Domain: signingca1.addons.mozilla.org

XIOC detected Domain: signingca1.addons.mozilla.org

extracted_from_files

URL

detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html

XIOC detected URL: https://html-preview.github.io/?url=https://raw.githubusercontent.com/apersongithub/Duolingo-Unlimited-Hearts/refs/heads/main/extras/donations.html

extracted_from_files

Security Analysis Summary

Security Analysis Overview

Duolingo Max is a Firefox Add-ons extension published by apersongithub. Version 3.5 has been analyzed by the Risky Plugins security platform, receiving a risk score of 84.86/100 (HIGH risk) based on 101 security findings.

Risk Assessment

This extension presents critical security risk. Severe issues were detected, potentially including malware indicators, exposed secrets, or dangerous behaviors. Installation is strongly discouraged until these issues are addressed.

Findings Breakdown

High: 33 finding(s)
Medium: 68 finding(s)

What Was Analyzed

The security assessment covers multiple analysis categories:

Malware Detection: YARA rule matching against 2,400+ malware signatures
Secret Detection: Scanning for exposed API keys, tokens, and credentials
Static Analysis: Code-level security analysis for common vulnerability patterns
Network Analysis: Detection of suspicious network communications and endpoints
Obfuscation Detection: Identification of code obfuscation techniques

Developer Information

Duolingo Max is published by apersongithub on the Firefox Add-ons marketplace. The extension has approximately 1K users.

Recommendation

This extension is not recommended for installation without thorough manual review. Consider alternatives with lower risk scores, or contact the developer to address the identified security concerns.

Source Code Viewer

Source Code Not Available

Source code is not available for this version of the extension.

Frequently Asked Questions

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Is "Duolingo Max" on Firefox Add-ons Safe to Install?

Risk Assessment

Severity Breakdown

Finding Categories

YARA Rules Matched

Requested Permissions

About This Extension

Detailed Findings

OBFUSCATION-SUSPICIOUS_EXTERNAL_IMPORT-popup.js-0

NET-FETCH-popup.js-18

NET-FETCH-injection.js-16

NET-FETCH-background.js-5

NET-FETCH-banner.js-321

NET-FETCH-shared/defaults.js-11

NET-FETCH-banner.js-141

YARA Rule Matches

LocalStorageShouldNotBeUsed

postinstall file manipulation

postinstall file download

postinstall system command

postinstall network communication

postinstall persistence mechanism

Indicators of Compromise

All Indicators · 60

Security Analysis Summary

Security Analysis Overview

Risk Assessment

Findings Breakdown

What Was Analyzed

Developer Information

Recommendation

Frequently Asked Questions

Similar Extensions

Speech Recognition Polyfill (STT)

Duoblock Origin

Duolingo Max

SN Utils

Traducteur PIKA

IntelliBuddies Web Automation