# Avast Online Security & Privacy

> Secure your Mozilla Firefox browser against real-time online threats, trackers, and scams. We’ll check every site you visit, from Facebook to your bank, so nothing puts you or your data at risk. Join a growing community of 400 million Avast users.

Canonical page: [https://chrome-stats.com/d/avast-online-security](https://chrome-stats.com/d/avast-online-security)

## Overview

- **ID:** `avast-online-security`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** AVAST Software
- **Category:** privacy-security,alerts-updates,other
- **Daily users:** 4,473
- **Weekly downloads:** 209
- **Rating:** 4.46 / 5 (1,629 ratings)
- **Version:** 22.12.189
- **Last updated:** 2024-05-14
- **First published:** 2013-11-27
- **Size:** 187 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/avast-online-security/)
- **Website:** [https://support.avast.com](https://support.avast.com/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/avast-online-security/privacy/](https://addons.mozilla.org/firefox/addon/avast-online-security/privacy/)

## Description

Avast Online Security & Privacy is a powerful Chrome extension designed to safeguard your Mozilla Firefox browser from real-time online threats, phishing scams, and invasive trackers. With a community of over 400 million users, Avast actively monitors every site you visit—from social media platforms like Facebook to your online banking sites—to ensure your personal data remains secure. Key features include identifying and blocking phishing sites, instant website risk ratings by hovering over links, blocking tracking cookies, removing your details from advertisers' databases, and optimizing privacy settings across your favorite platforms.

By automatically requesting sites to stop tracking and selling your data, Avast enhances your online privacy seamlessly. The extension collects minimal data such as URLs for safety checks and aggregated usage statistics to improve performance while respecting your privacy. Installing this extension means consenting to Avast's privacy policy and license agreement, making it a trusted choice for anyone looking to protect their online experience effectively.

## Rankings

- #1,278 — Overall
- #30 — Alerts & Updates
- #194 — Other extensions
- #263 — Privacy & Security
- #2 — online
- #10 — security

## Permissions and access

### Permissions

- `https://*/*`
- `http://*/*`
- `tabs`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low 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).

## Review summary

Users generally valued Avast Online Security & Privacy when it was actively supported on Firefox, appreciating its security features and Avast’s brand. However, the discontinuation of Firefox support has caused significant frustration and disappointment. Many users criticize Avast for ending support due to Firefox’s smaller market share versus Chrome and Edge, which they believe are forced on users. Complaints also include concerns about privacy, permissions, and unwanted installation. Overall, the removal of Firefox support has diminished the add-on’s usefulness and led to negative opinions among former users.

### Pros

- Users appreciated the add-on when it was supported and functional in Firefox.
- Some users liked Avast's overall antivirus and security products, indicating positive brand trust.
- The add-on had a history of being a 5-star tool before support ended.
- A few users expressed personal liking towards the add-on despite issues.

### Cons

- The add-on is no longer supported on Firefox, leading to dissatisfaction.
- Users are frustrated with Avast ending support due to Firefox’s lower market share compared to Chrome and Edge.
- There is annoyance about forced browser choices that make Firefox less popular, leading to discontinuation of support.
- Some users feel the add-on offers no privacy or functionality after the support ends.
- Several users express distrust or frustration regarding permissions and silent installation.

## Similar extensions and apps

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