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.

Avast Online Security & Privacy: Secure Browsing for Firefox
Avast Online Security & Privacy is an add-on developed to provide high security and privacy for Firefox users. It blocks phishing sites, intrusive trackers, and invasive ads. This extension optimizes privacy settings and requests sites to stop tracking user data. It safeguards your personal information and enhances the browsing experience by performing real-time risk analysis of visited sites.
Add-on stats
Manifest V2
By: AVAST Software
Rating: 4.46
2 ratings
(1,631)
Weekly download count: 850
Firefox on Android: No
Permissions:
- https://*/*
- http://*/*
- tabs
Size: 191.03K
Email: su*****@avast.com
URLs: Website ,Privacy policy
Full description: See detailed description
Ranking
# 780 ▼ 11
Other platforms
Not available on Chrome
Not available on Android
User reviews
Pros
Cons
- Ended support for Firefox
- User dissatisfaction with privacy concerns
- Limited functionality after discontinuation
- Installation issues
- Users feel 'forced' to use other browsers
Most mentioned
- Discontinuation of support for Firefox
- Loss of privacy
- Frustration over ending compatibility with Firefox
- Users questioning their choice in antivirus provider due to support changes
User reviews
by candido, 2025-03-01
Suddenly popped up to install.,No privacy at all.,So I didn't notice that I installed this *** thing.,Do you want to lock my permissions and then don't let me use the computer? Rogue Bundle (BRUH)
by snakepaschaos, 2025-02-13
by 天灭中共退党团队保平安, 2025-02-10
Add-on safety
Risk impact
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
We don't have sufficient data to confidently determine the risk likelihood of Avast Online Security & Privacy. Use it at your own risk.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
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