SECURITY REPORT · EXTENSHI SCAN
UltraBlock - Ultimate AdBlocker
Firefox extension·by arena tech
0
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
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
UltraBlock - Ultimate AdBlocker's safety score vs every other extension we've scanned
Globally
22%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
16%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
34
median 5Lower is safer
Critical findings
4
median 0Severity = Critical
Permissions
22
median 4Declared in manifest
Active users
6
median 3vs category median
Findings breakdown
Automated security signal · 34 distinct issues across 6 severities
34
distinct issues
detected
detected
Critical412%
High39%
Needs Review00%
Medium2574%
Low26%
Info00%
Permissions requested
4 risky permissions of 22 total
1 critical permission require attention
This extension requests 22 permissions in total. 4 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
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
View open tabs
Can see URLs and titles of all open tabs
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
Show notifications
Can display desktop notifications outside the browser
Medium
Add context menu items
Can add custom items to the right-click context menu
Medium
Monitor navigation
Can observe and track tab navigation events and URL changes
Info
*://*.youtube.com/*
No additional information available.
Info
*://youtube.com/*
No additional information available.
Info
*://*.youtu.be/*
No additional information available.
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Scan performed by extenshi.io · Aug 24, 2026
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