SECURITY REPORT · EXTENSHI SCAN
MetaMask Flask
Firefox extension·by MetaMask Labs
0
/ 100 SAFETY SCORE
CRITICAL
Severe indicators. Treat as unsafe until the developer addresses these findings.
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
MetaMask Flask's safety score vs every other extension we've scanned
Globally
0%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Productivity
1%of productivity extensions carry more risk
Riskier ←→ Safer
Ranked against 6,496 productivity extensions
Findings
1316
median 17Lower is safer
Critical findings
5
median 0Severity = Critical
Permissions
17
median 3Declared in manifest
Active users
46
median 140vs category median
Findings breakdown
Automated security signal · 1,316 distinct issues across 6 severities
1,316
distinct issues
detected
detected
1 square ≈ 3 issues
Scanners reported 1,416 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical50%
High413%
Needs Review00%
Medium31824%
Low90569%
Info474%
Permissions requested
6 risky permissions of 17 total
6 high-risk permissions require attention
This extension requests 17 permissions in total. 6 of them grant broad capabilities that are worth a careful look.
High
Access all HTTP sites
Can read and modify content on all non-encrypted websites
High
Access all HTTPS sites
Can read and modify content on all encrypted websites
High
Observe web requests
Can monitor all network requests made by the browser
High
Block and modify web requests
Can intercept, block, or modify any network request before it completes
High
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
High
Access local files
Can read files on your local filesystem opened in the browser
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Medium
Write to clipboard
Can place content onto your clipboard
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Medium
Show notifications
Can display desktop notifications outside the browser
Medium
Access user identity
Can get OAuth2 tokens and access your Google account identity
Medium
Read clipboard
Can read text and data currently on your clipboard
Info
ws://*/*
No additional information available.
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Scan performed by extenshi.io · Jul 27, 2026
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