SECURITY REPORT · EXTENSHI SCAN
SingleFile Legacy
Firefox extension·by gildas
0
/ 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
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
2%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
104
median 5Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
12
median 4Declared in manifest
Active users
124
median 3vs category median
Findings breakdown
Automated security signal · 104 distinct issues across 6 severities
104
distinct issues
detected
detected
Critical11%
High99%
Needs Review00%
Medium8784%
Low77%
Info00%
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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