Known Sites

Name: Known Sites
Author: Marcono1234

By: Marcono1234

Blocks websites which the user had not opened before.

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Install

Features & Capabilities

Blocks websites which the user had not opened before.

The goal of this extension is to help protect against phishing attacks and against accidental typos when typing a URL. Users should however still be vigilant when opening links.

This is a hobby project and might not provide good protection. Do not rely on it for professional phishing protection.

Browser history and bookmarks are used to determine whether the user has opened a website before. The data is kept locally on the device, it is not transferred to any server and not used for any other purposes.

User Growth & Download Statistics

Add-on

By:

Marcono1234

Daily users:

Version:

1.1.0 Last updated: 2026-07-03

Version code:

6336629

Creation date:

2022-03-22

Risk:

Permissions:

Size:

166.87KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-12

Compare stats and ranking:

Ranking

# 107,169 ▲ 3,078

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Marcono1234

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/known-sites/

Website:

https://github.com/Marcono1234/known-sites-extension

Is Known Sites Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Known Sites requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Known Sites is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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