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SECURITY REPORT · EXTENSHI SCAN

Crumb – Ad Blocker

Firefox extension·by KernelPhreak
68
/ 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

Crumb – Ad Blocker's safety score vs every other extension we've scanned
Globally
11%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 415,560 extensions
In Privacy & Security
9%of privacy & security extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 12,616 privacy & security extensions
Findings
22
median 8Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
10
median 4Declared in manifest
Active users
5
median 3vs category median

Findings breakdown

Automated security signal · 22 distinct issues across 6 severities
22
distinct issues
detected

Permissions requested

5 risky permissions of 10 total
5 high-risk permissions require attention
This extension requests 10 permissions in total. 5 of them grant broad capabilities that are worth a careful look.
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
Filter responses

Can filter and modify HTTP response bodies

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

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Custom menus

Can add custom items to the browser context menu

Medium
Unlimited local storage

Can store large amounts of data locally without size limits

Medium
DNS resolution

Can perform DNS lookups

Low
Schedule tasks

Can schedule periodic background tasks

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Scan performed by extenshi.io · Sep 6, 2026
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