Avast Online Security & Privacy

Name: Avast Online Security & Privacy
Rating: 4.458 (1631 reviews)
Author: AVAST Software

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.

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Features & Capabilities

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.

User Growth & Download Statistics

Add-on Privacy & Security

By:

Daily users:

Rating:

Version:

22.12.189 Last updated: 2024-05-14

Version code:

5735896

Creation date:

2013-11-27

Risk:

Permissions:

https://*/*
http://*/*
tabs

Size:

186.55KB

Email:

su*****@avast.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-20

Compare stats and ranking:

Ranking

# 1,171 ▲ 11

Other rankings

#24 in Alerts & Updates

#187 in Other extensions ▼ 3

#240 in Privacy & Security ▲ 2

#3 in online keyword 67

#10 in security keyword 84

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Other platforms

Avast Online Security & Privacy (v22.11.179)

1,866,513 4.60

(1,003)

For Developers

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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:

AVAST Software

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/avast-online-security/

Email:

su*****@avast.com

Website:

https://support.avast.com

Permission Change History

2024-05-14: Version 22.11.180 → 22.12.189

Remove Permissions: storage webNavigation webRequest webRequestBlocking

User Reviews

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.

Recent reviews

It's not working anymore, the jackasses at Avast dropped support for the extension only for Firefox but not for Chromium browsers. Better look for a Firefox friendly alternative instead. This page shows upon installing the extension: English: support.avast.com/en-us/article/aosp-firefox-discontinuation-faq/#pc Spanish: support.avast.com/es-mx/article/aosp-firefox-discontinuation-faq/#pc

by Mi*****, 2026-04-18

Ne fonctionne plus et arrêter par Avast eux-même.

by Bl*****, 2026-03-16

by Or*****, 2025-07-27

View all user reviews ›

Is Avast Online Security & Privacy 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.

Avast Online Security & Privacy 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.

Avast Online Security & Privacy has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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