Is Duolingo Fast Mode safe to use?

Duolingo Fast Mode has a security risk score of 40.07/100 (MEDIUM risk). Our security analysis detected 97 findings. Review the detailed security assessment below to understand the specific risks before installation.

What are the security risks of Duolingo Fast Mode?

Based on our automated security analysis, Duolingo Fast Mode presents medium 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 Fast Mode" on Firefox Add-ons Safe to Install?

Name: Duolingo Fast Mode
Availability: InStock
Author: Freinorg

Freinorg · firefox · v1.5.0

Features Provides immediate feedback on correctness Auto complete using buttons or hotkeys Indicates when the task is safe to check Supports all non speaking challeng

Risk Assessment

Analyzed

40.07

out of 100

MEDIUM

97 security findings detected across all analyzers

Firefox extension requesting 4 permissions

Severity Breakdown

Critical

High

Medium

Low

Info

Finding Categories

Malware Signatures

IoC Indicators

YARA Rules Matched

8 rules(25 hits)

postinstall crypto operations LocalStorageShouldNotBeUsed postinstall file manipulation postinstall network communication postinstall system command postinstall file download NoUseEval postinstall obfuscation

Requested Permissions

4 permissions

storage

Low

unlimitedStorage

Low

https://www.duolingo.com/*

Low

https://www.duolingo.com/

Low

About This Extension

Features <ul><li>Provides immediate feedback on correctness</li><li>Auto complete using buttons or hotkeys</li><li>Indicates when the task is safe to check</li><li>Supports all non speaking challeng</li></ul>

Detailed Findings

25 total

YARA Rule Matches

8 rules

Indicators of Compromise

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

URLs

IP Addresses

Domains

Strings

All Indicators · 71

Domain

detected Domain: challenge.choices.map

XIOC detected Domain: challenge.choices.map

extracted_from_files

Domain

detected Domain: signingca1.addons.mozilla.org

XIOC detected Domain: signingca1.addons.mozilla.org

extracted_from_files

Domain

detected Domain: api.storage

XIOC detected Domain: api.storage

extracted_from_files

Domain

detected Domain: api.windows

XIOC detected Domain: api.windows

extracted_from_files

Other

detected Email: [email protected]

XIOC detected Email: [email protected]

extracted_from_files

Domain

detected Domain: rule.id

XIOC detected Domain: rule.id

extracted_from_files

Domain

detected Domain: condition.domains

XIOC detected Domain: condition.domains

extracted_from_files

Domain

detected Domain: downloads.download

XIOC detected Domain: downloads.download

extracted_from_files

Domain

detected Domain: api.downloads.download

XIOC detected Domain: api.downloads.download

extracted_from_files

Domain

detected Domain: originaldownload.call

XIOC detected Domain: originaldownload.call

extracted_from_files

Domain

detected Domain: adaptedoptions.buttons.map

XIOC detected Domain: adaptedoptions.buttons.map

extracted_from_files

Domain

detected Domain: originalcreate.call

XIOC detected Domain: originalcreate.call

extracted_from_files

Domain

detected Domain: item.correcttokens.map

XIOC detected Domain: item.correcttokens.map

extracted_from_files

Domain

detected Domain: e.id

XIOC detected Domain: e.id

extracted_from_files

Domain

detected Domain: tab.id

XIOC detected Domain: tab.id

extracted_from_files

Domain

detected Domain: console.info

XIOC detected Domain: console.info

extracted_from_files

Domain

detected Domain: resourcetypes.map

XIOC detected Domain: resourcetypes.map

extracted_from_files

Domain

detected Domain: t.host

XIOC detected Domain: t.host

extracted_from_files

detected IP: ::bef

XIOC detected IP: ::bef

extracted_from_files

Domain

detected Domain: targetinfo.id

XIOC detected Domain: targetinfo.id

extracted_from_files

Domain

detected Domain: foundchallenge.id

XIOC detected Domain: foundchallenge.id

extracted_from_files

Domain

detected Domain: target.click

XIOC detected Domain: target.click

extracted_from_files

Domain

detected Domain: info.id

XIOC detected Domain: info.id

extracted_from_files

Domain

detected Domain: button.id

XIOC detected Domain: button.id

extracted_from_files

Domain

detected Domain: panel.id

XIOC detected Domain: panel.id

extracted_from_files

Domain

detected Domain: www.duolingo.com

XIOC detected Domain: www.duolingo.com

extracted_from_files

Domain

detected Domain: challenge.id

XIOC detected Domain: challenge.id

extracted_from_files

Domain

detected Domain: challenge.displaytokens.map

XIOC detected Domain: challenge.displaytokens.map

extracted_from_files

Domain

detected Domain: challenge.dialogue.map

XIOC detected Domain: challenge.dialogue.map

extracted_from_files

Domain

detected Domain: x.displaytokens.map

XIOC detected Domain: x.displaytokens.map

extracted_from_files

Domain

detected Domain: browser.sidebaraction.open

XIOC detected Domain: browser.sidebaraction.open

extracted_from_files

Domain

detected Domain: challenge.pairs.map

XIOC detected Domain: challenge.pairs.map

extracted_from_files

Domain

detected Domain: gcurritem.id

XIOC detected Domain: gcurritem.id

extracted_from_files

Domain

detected Domain: elem.id

XIOC detected Domain: elem.id

extracted_from_files

Domain

detected Domain: elemouter.id

XIOC detected Domain: elemouter.id

extracted_from_files

Domain

detected Domain: e.data

XIOC detected Domain: e.data

extracted_from_files

Domain

detected Domain: e.data.data

XIOC detected Domain: e.data.data

extracted_from_files

Domain

detected Domain: cleaned.id

XIOC detected Domain: cleaned.id

extracted_from_files

Domain

detected Domain: data.id

XIOC detected Domain: data.id

extracted_from_files

Domain

detected Domain: item.id

XIOC detected Domain: item.id

extracted_from_files

Domain

detected Domain: found.click

XIOC detected Domain: found.click

extracted_from_files

Domain

detected Domain: correctoption.click

XIOC detected Domain: correctoption.click

extracted_from_files

Domain

detected Domain: types.select

XIOC detected Domain: types.select

extracted_from_files

Domain

detected Domain: playernext.click

XIOC detected Domain: playernext.click

extracted_from_files

Domain

detected Domain: option.click

XIOC detected Domain: option.click

extracted_from_files

Domain

detected Domain: pair.audio

XIOC detected Domain: pair.audio

extracted_from_files

Domain

detected Domain: link.nextsibling.click

XIOC detected Domain: link.nextsibling.click

extracted_from_files

Domain

detected Domain: www.w3.org

XIOC detected Domain: www.w3.org

extracted_from_files

Domain

detected Domain: date.now

XIOC detected Domain: date.now

extracted_from_files

Domain

detected Domain: button.click

XIOC detected Domain: button.click

extracted_from_files

Domain

detected Domain: info.target

XIOC detected Domain: info.target

extracted_from_files

Domain

detected Domain: elem.select

XIOC detected Domain: elem.select

extracted_from_files

Domain

detected Domain: item.correctindices.map

XIOC detected Domain: item.correctindices.map

extracted_from_files

Domain

detected Domain: alt.elem.click

XIOC detected Domain: alt.elem.click

extracted_from_files

detected IP: ::af

XIOC detected IP: ::af

extracted_from_files

Domain

detected Domain: sidepanel.open

XIOC detected Domain: sidepanel.open

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: converted-extension.org

XIOC detected Domain: converted-extension.org

extracted_from_files

Domain

detected Domain: tc4ddc3129e2875d266a6d8794959b616.f7f4466afe14e58a90de61dad4f3d11f.addons.mozilla.org

XIOC detected Domain: tc4ddc3129e2875d266a6d8794959b616.f7f4466afe14e58a90de61dad4f3d11f.addons.mozilla.org

extracted_from_files

Domain

detected Domain: privacy.services

XIOC detected Domain: privacy.services

extracted_from_files

Domain

detected Domain: privacy.network

XIOC detected Domain: privacy.network

extracted_from_files

URL

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

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

extracted_from_files

URL

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

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

extracted_from_files

URL

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

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

extracted_from_files

URL

detected URL: https://www.duolingo.com/2017-06-30/sessions

XIOC detected URL: https://www.duolingo.com/2017-06-30/sessions

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

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

extracted_from_files

Hash

detected MD5 Hash: f7f4466afe14e58a90de61dad4f3d11f

XIOC detected MD5 Hash: f7f4466afe14e58a90de61dad4f3d11f

extracted_from_files

URL

detected Domain: url.search

XIOC detected Domain: url.search

extracted_from_files

Security Analysis Summary

Security Analysis Overview

Duolingo Fast Mode is a Firefox Add-ons extension published by Freinorg. Version 1.5.0 has been analyzed by the Risky Plugins security platform, receiving a risk score of 40.07/100 (MEDIUM risk) based on 97 security findings.

Risk Assessment

This extension presents moderate security risk. Several findings were detected that may warrant attention. Users should carefully review the permissions and findings before installation.

Findings Breakdown

High: 25 finding(s)
Medium: 72 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 Fast Mode is published by Freinorg on the Firefox Add-ons marketplace. The extension has approximately 27 users.

Recommendation

Exercise caution with this extension. Review the detailed findings and ensure the requested permissions align with the extension's stated functionality before installation.

Source Code Viewer

Source Code Not Available

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