SECURITY REPORT · EXTENSHI SCAN
UltraBlock - Privacy & Adblock
Firefox extension·by UltraBlock
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 - Privacy & Adblock's safety score vs every other extension we've scanned
Globally
10%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Privacy & Security
7%of privacy & security extensions carry more risk
Riskier ←→ Safer
Ranked against 11,537 privacy & security extensions
Findings
319
median 5Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
10
median 4Declared in manifest
Active users
248
median 3vs category median
Findings breakdown
Automated security signal · 319 distinct issues across 6 severities
319
distinct issues
detected
detected
Scanners reported 324 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical10%
High83%
Needs Review00%
Medium29693%
Low113%
Info31%
Permissions requested
8 risky permissions of 10 total
1 critical permission require attention
This extension requests 10 permissions in total. 8 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
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
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
High
Delete browsing data
Can remove browsing history, cookies, cache, and other browsing data
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
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Scan performed by extenshi.io · Aug 24, 2026
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