Is "WebP → JPEG Downloader" on Firefox Add-ons Safe to Install?
webp is a vile and horrible file format invented by the dark wizards at G*ogle. We hate it. This extension quietly converts all webps to jpeg before downloading them. Never have to worry about it again.
Risk Assessment
Analyzed23 security findings detected across all analyzers
Firefox extension requesting 3 permissions
Severity Breakdown
Finding Categories
YARA Rules Matched
4 rules(8 hits)Requested Permissions
3 permissionsAccess and modify data on every website you visit
Manage, modify, and monitor downloads
About This Extension
Detailed Findings
11 totalYARA Rule Matches
4 rulesIndicators of Compromise
Network indicators, suspicious strings, and potential IoCs extracted during analysis
All Indicators · 12
detected Domain: readme.md XIOC detected Domain: readme.md
extracted_from_files
detected Domain: a.download XIOC detected Domain: a.download
extracted_from_files
detected Domain: a.click XIOC detected Domain: a.click
extracted_from_files
detected URL: http://addons.mozilla.org/ca/crl.pem0N XIOC detected URL: http://addons.mozilla.org/ca/crl.pem0N
extracted_from_files
detected MD5 Hash: b29d05d374cb46c83434b8bdabaacbe6 XIOC detected MD5 Hash: b29d05d374cb46c83434b8bdabaacbe6
extracted_from_files
detected Domain: signingca1.addons.mozilla.org XIOC detected Domain: signingca1.addons.mozilla.org
extracted_from_files
detected Domain: mozilla.com XIOC detected Domain: mozilla.com
extracted_from_files
detected Domain: content-signature.mozilla.org XIOC detected Domain: content-signature.mozilla.org
extracted_from_files
detected Domain: tc12f81beb6f929d5983b6f9de6df5d9a.b29d05d374cb46c83434b8bdabaacbe6.addons.mozilla.org XIOC detected Domain: tc12f81beb6f929d5983b6f9de6df5d9a.b29d05d374cb46c83434b8bdabaacbe6.addons.mozilla.org
extracted_from_files
detected Domain: tab.id XIOC detected Domain: tab.id
extracted_from_files
detected Domain: item.id XIOC detected Domain: item.id
extracted_from_files
detected Domain: browser.downloads.download XIOC detected Domain: browser.downloads.download
extracted_from_files
Security Analysis Summary
Security Analysis Overview
WebP → JPEG Downloader is a Firefox Add-ons extension published by FAST. Version 2.1.0 has been analyzed by the Risky Plugins security platform, receiving a risk score of 84.84/100 (HIGH risk) based on 23 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: 8 finding(s)
- Medium: 15 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
WebP → JPEG Downloader is published by FAST on the Firefox Add-ons marketplace. The extension has approximately 31 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 Not Available
Source code is not available for this version of the extension.
Frequently Asked Questions
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