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.

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Avast Online Security & Privacy is available to install from Firefox Browser Add-ons and for download from this page. It has 178,423 active users The latest version is 22.12.189, and it was published 2 days ago.

All available versions

You can find the current and older versions of Avast Online Security & Privacy here. You can download the archived versions or inspect their source codes.

As a free user, you can only download the latest version.

How to install Avast Online Security & Privacy from an XPI file

1. Simply drag-and-drop the XPI into Firefox to install the add-on.

How to install Avast Online Security & Privacy from a ZIP file

1. Download the Avast Online Security & Privacy ZIP file
2. In Firefox browser, go to about:addons to open Add-ons Manager
3. Click on , then select Install Add-on From File
4. Select the Avast Online Security & Privacy ZIP file from step 1. Avast Online Security & Privacy is now installed on your browser.