SECURITY REPORT · EXTENSHI SCAN

SingleFile Legacy

Firefox extension·by gildas
25
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.

Likely abandonedsafety score reduced by 30 points

  • No update in over 5 years
Why this matters

An unmaintained extension keeps whatever flaws it shipped with, and a listing with users but no owner is an attractive target to buy and repurpose.

Automated analysis of publicly available code — not a professional security audit. It may produce false positives and does not prove an extension is unsafe or safe. Treat it as one signal among many. Disclaimer · Report an issue

How it ranks

SingleFile Legacy's safety score vs every other extension we've scanned
Globally
3%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 402,632 extensions
In Privacy & Security
2%of privacy & security extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 12,500 privacy & security extensions
Findings
104
median 5Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
12
median 4Declared in manifest
Active users
139
median 3vs category median

Findings breakdown

Automated security signal · 104 distinct issues across 6 severities
104
distinct issues
detected

Permissions requested

6 risky permissions of 12 total
1 critical permission require attention
This extension requests 12 permissions in total. 6 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites

Can read and modify content on every website you visit

High
Manage downloads

Can initiate downloads and access your download history

High
View open tabs

Can see URLs and titles of all open tabs

High
Developer tools

Can extend browser developer tools with custom panels

High
Observe web requests(optional)

Can monitor all network requests made by the browser

High
Block and modify web requests(optional)

Can intercept, block, or modify any network request before it completes

Medium
Access user identity

Can get OAuth2 tokens and access your Google account identity

Medium
Custom menus

Can add custom items to the browser context menu

Medium
Write to clipboard

Can place content onto your clipboard

Medium
Add context menu items

Can add custom items to the right-click context menu

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Access bookmarks

Can read and modify your saved bookmarks

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Scan performed by extenshi.io · Aug 24, 2026
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