extenshi.io
SECURITY REPORT · EXTENSHI SCAN

AdBlocker Ultimate

Firefox extension·by AdAvoid
28
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.

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

AdBlocker Ultimate's safety score vs every other extension we've scanned
Globally
0%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 409,539 extensions
In Privacy & Security
0%of privacy & security extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 12,541 privacy & security extensions
Findings
246
median 5Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
14
median 4Declared in manifest
Active users
1071639
median 3vs category median

Findings breakdown

Automated security signal · 246 distinct issues across 6 severities
246
distinct issues
detected
Scanners reported 249 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.

Permissions requested

7 risky permissions of 14 total
1 critical permission require attention
This extension requests 14 permissions in total. 7 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
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

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 all HTTP sites

Can read and modify content on all non-encrypted websites

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
Add context menu items

Can add custom items to the right-click context menu

Medium
Read clipboard

Can read text and data currently on your clipboard

Medium
Write to clipboard

Can place content onto your clipboard

Info
https://*.adblockultimate.net/welcome*

No additional information available.

Info
https://*.adblockultimate.net/*/welcome*

No additional information available.

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Scan performed by extenshi.io · Sep 1, 2026
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