SECURITY REPORT · EXTENSHI SCAN
BlockMask
Firefox extension·by ARR552
0
/ 100 SAFETY SCORE
CRITICAL
Severe indicators. Treat as unsafe until the developer addresses these findings.
Likely abandonedsafety score reduced by 30 points
- No update in over 7 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
BlockMask's safety score vs every other extension we've scanned
Globally
14.829999999999998%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
4.829999999999998%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
135
median 38Lower is safer
Risky permissions
2
median 1Critical + high perms
Total permissions
7
median 4All declared perms
Critical findings
9
median 2Severity = Critical
Findings breakdown
Automated security signal · 135 distinct issues across 6 severities
135
distinct issues
detected
detected
Scanners reported 162 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical97%
High2116%
Needs Review00%
Medium8462%
Low1511%
Info64%
Permissions requested
2 risky permissions of 7 total
2 high-risk permissions require attention
This extension requests 7 permissions in total. 2 of them grant broad capabilities that are worth a careful look.
High
View open tabs
Can see URLs and titles of all open tabs
High
Observe web requests
Can monitor all network requests made by the browser
Medium
Monitor navigation
Can observe and track tab navigation events and URL changes
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Info
*://*/*
No additional information available.
Info
*://twitter.com/*
No additional information available.
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Scan performed by extenshi.io · Jul 25, 2026· partial run (some scanners failed)
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