Is Back to the old sidebar on YouTube safe to use?

Back to the old sidebar on YouTube has a security risk score of 20.15/100 (LOW risk). Our security analysis detected 10 findings. Review the detailed security assessment below to understand the specific risks before installation.

What are the security risks of Back to the old sidebar on YouTube?

Based on our automated security analysis, Back to the old sidebar on YouTube presents low 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 "Back to the old sidebar on YouTube" on Firefox Add-ons Safe to Install?

Name: Back to the old sidebar on YouTube
Availability: InStock
Rating: 5 (1 reviews)
Author: Nostrum

Nostrum · firefox · v1.2

At the very beginning of February 2026, YouTube reduced the width of the right sidebar next to YouTube videos. YouTube Slim Sidebar reduces the width of the recommendations sidebar on the right side of YouTube videos on desktop, restoring it to how it was before 2026. The extension helps keep the YouTube interface cleaner and less cluttered, without completely removing suggestions. Ideal for focusing on the video while keeping what matters. Features Reduced width of the recommendation sidebar More compact and balanced interface No changes to the video player Works automatically on YouTube Privacy No data collection No tracking No unnecessary access Lightweight, simple, and discreet extension.

Risk Assessment

Analyzed

20.15

out of 100

LOW

10 security findings detected across all analyzers

Firefox extension requesting 1 permission

Severity Breakdown

Critical

High

Medium

Low

Info

Finding Categories

IoC Indicators

Requested Permissions

1 permission

*://*.youtube.com/*

Low

About This Extension

At the very beginning of February 2026, YouTube reduced the width of the right sidebar next to YouTube videos. <strong>YouTube Slim Sidebar</strong> reduces the width of the recommendations sidebar on the right side of YouTube videos on desktop, restoring it to how it was before 2026. The extension helps keep the YouTube interface cleaner and less cluttered, without completely removing suggestions. Ideal for focusing on the video while keeping what matters. Features <ul><li>Reduced width of the recommendation sidebar</li><li>More compact and balanced interface</li><li>No changes to the video player</li><li>Works automatically on YouTube</li></ul> Privacy <ul><li>No data collection</li><li>No tracking</li><li>No unnecessary access</li></ul> Lightweight, simple, and discreet extension.

No Findings

All security checks passed

Indicators of Compromise

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

URLs

Domains

Strings

All Indicators · 10

Domain

detected Domain: signingca1.addons.mozilla.org

XIOC detected Domain: signingca1.addons.mozilla.org

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: 74fa16265387c9835c74407d1020a5da

XIOC detected MD5 Hash: 74fa16265387c9835c74407d1020a5da

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: taacd4c3441ba58260ae8a5a0a74dc4c1.74fa16265387c9835c74407d1020a5da.addons.mozilla.org

XIOC detected Domain: taacd4c3441ba58260ae8a5a0a74dc4c1.74fa16265387c9835c74407d1020a5da.addons.mozilla.org

extracted_from_files

Domain

detected Domain: youtube.com

XIOC detected Domain: youtube.com

extracted_from_files

Other

detected Email: [email protected]

XIOC detected Email: [email protected]

extracted_from_files

Other

detected Email: [email protected]

XIOC detected Email: [email protected]

extracted_from_files

Security Analysis Summary

Security Analysis Overview

Back to the old sidebar on YouTube is a Firefox Add-ons extension published by Nostrum. Version 1.2 has been analyzed by the Risky Plugins security platform, receiving a risk score of 20.15/100 (LOW risk) based on 10 security findings.

Risk Assessment

This extension presents low security risk. Some minor findings were detected, but nothing that would prevent typical usage. Reviewing the detailed findings below is recommended before use in sensitive environments.

Findings Breakdown

Medium: 10 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

Back to the old sidebar on YouTube is published by Nostrum on the Firefox Add-ons marketplace. The extension has approximately 4 users.

Recommendation

Based on the automated security analysis, this extension appears safe for general use. As with any extension, users should review the requested permissions before installation.

Source Code Viewer

Source Code Not Available

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