# OverPhish: Phishing Domain Blocker

> OverPhish blocks phishing and malware domains in real time using daily-updated public blocklists — 100% local processing, zero telemetry, fully auditable source code for transparency.

Canonical page: [https://chrome-stats.com/d/overphish](https://chrome-stats.com/d/overphish)

## Overview

- **ID:** `overphish`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** OverPhish: Phishing Domain Blocker
- **Category:** privacy-security
- **Daily users:** 1
- **Version:** 1.1.0
- **Last updated:** 2026-02-14
- **First published:** 2026-02-11
- **Size:** 215 KB
- **Data as of:** 2026-09-13
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/overphish/)
- **Website:** [https://overphish.app](https://overphish.app/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/overphish/privacy/](https://addons.mozilla.org/firefox/addon/overphish/privacy/)

## Description

<strong>OverPhish: Phishing &amp; Malware Domain Blocker</strong>

Stop phishing before it stops you. OverPhish is a lightweight, privacy-first browser extension that blocks access to known phishing and malware domains in real time — all processing happens locally in your browser.

<strong>Key Features</strong>
- <strong>Instant Protection</strong> — Uses a fast Bloom filter + reversed suffix Trie for sub-millisecond domain checks. Blocks malicious sites before they load.
- <strong>Daily Updated Blocklist</strong> — Automatically merges high-quality public sources (OpenPhish, PhishTank, URLHaus, Hagezi TIF, Jarelllama Scam Blocklist) every 24 hours.
- <strong>100% Private &amp; Local</strong> — Zero telemetry, no accounts, no data collection. The only network request is the daily download of a public, plain-text blocklist from <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/7a098ed374278f3485ef3f1e5b8a8274c1a6e7d6950296ee824f84261b52c3d9/http%3A//overphish.io/blocklist.txt" rel="nofollow">overphish.io/blocklist.txt</a>. Nothing about your browsing ever leaves your device.
- <strong>User-Friendly Controls</strong> — Clear block page with "Allow Once" (temporary bypass) and permanent whitelist options. Built-in permanent whitelist for major providers (Google, Microsoft, Apple, etc.) to avoid breaking legitimate sites.
- <strong>Lightweight &amp; Efficient</strong> — Under 300KB install size. No performance impact, even on lower-end devices.
- <strong>Transparency &amp; Audit-Friendly</strong> — The full source code is publicly available on GitHub for independent verification and security auditing (redistribution prohibited). See the repository for details.

<strong>How It Works</strong>
OverPhish intercepts navigation requests and checks domains against a local index built from the latest blocklist. If a match is found, it blocks the request and shows a warning page — <strong>preventing phishing pages from loading.</strong>

<strong>Privacy First</strong>
OverPhish collects <strong>absolutely nothing</strong>. No tracking pixels, no analytics, no user data transmission. All threat detection runs entirely offline after the initial blocklist fetch.
Full <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/6403ab0bb2e6ea30a52056845e26dd1d54f3e37bbe759f8bd27dea52226aa7a3/https%3A//overphish.app/privacy" rel="nofollow">Privacy Policy</a>.

<strong>Supported Browsers</strong>
- Now available on Firefox!
- Also on <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c824285b9df26e433465c8f60670439c4cc08dc633fa0c98a9d2da1bbff90370/https%3A//chromewebstore.google.com/detail/overphish-phishing-domain/mapbfceckmkfnmecoadhfehmdpoomjoa" rel="nofollow">Chrome Web Store</a>
- Edge and other Chromium-based browsers via the Chrome store

<strong>Important Notes</strong>
- This extension uses Manifest V3 with declarativeNetRequest for efficient blocking.
- Source code is published solely for transparency and auditing — redistribution or republishing is strictly prohibited.
- Official downloads only from trusted stores. Never install from unofficial sources.

Help keep the web safer — install OverPhish today!

Questions or security reports? Visit <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/5b1014390450dc7b3f979e7a5fc1e489e4c242dac69d0e3aac024b74b1a06ec0/https%3A//overphish.app" rel="nofollow">overphish.app</a> or the GitHub repo.

## Rankings

- #107,817 — Overall
- #168 — domain
- #207 — malware

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `webNavigation`
- `declarativeNetRequest`
- `declarativeNetRequestWithHostAccess`
- `unlimitedStorage`
- `alarms`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/overphish)