extenshi.io
SECURITY REPORT · EXTENSHI SCAN

Sieve - Site & Content Blocker

Firefox extension·by Monolab Co.
71
/ 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

Sieve - Site & Content Blocker's safety score vs every other extension we've scanned
Globally
15%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 415,509 extensions
In Privacy & Security
12%of privacy & security extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 12,615 privacy & security extensions
Findings
47
median 7Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
17
median 4Declared in manifest
Active users
69
median 3vs category median

Findings breakdown

Automated security signal · 47 distinct issues across 6 severities
47
distinct issues
detected

Permissions requested

3 risky permissions of 17 total
1 critical permission require attention
This extension requests 17 permissions in total. 3 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
Execute scripts in pages

Can inject and execute JavaScript code in web pages

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
Monitor navigation

Can observe and track tab navigation events and URL changes

Low
Schedule tasks

Can schedule periodic background tasks

Low
Detect idle state

Can detect when your machine is idle, active, or locked

Low
Block network requests (declarative)

Can block or redirect network requests using predefined rules without seeing content

Info
*://*.twitter.com/*

No additional information available.

Info
*://*.x.com/*

No additional information available.

Are you the author of Sieve - Site & Content Blocker?

Claim this extension to respond to findings, add context, and earn a verified badge on extenshi.io.

Claim this extension

Add the badge to your README

Show Sieve - Site & Content Blocker's live security score on GitHub or in your docs
Extenshi security score badge preview
Markdown
[![Extenshi security score](https://catalog.extenshi.io/api/badge/368425)](https://catalog.extenshi.io/extensions/368425/security)
HTML
<a href="https://catalog.extenshi.io/extensions/368425/security"><img src="https://catalog.extenshi.io/api/badge/368425" alt="Extenshi security score" /></a>

The badge always shows the current score — it updates automatically after every scan.

Scan performed by extenshi.io · Aug 24, 2026
Browser extensions made transparent.