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Where can I download this extension as my f-secure is not updating to the latest version (Firefox shows Browsing Protection 1.0.856 Legacy Disabled)
The product should notify you through the macOS Notification Center that you need to install a new Firefox extension. If not, you can go to the product preferences, select the "Browsing protection" tab and click "Install browser extension" and the product should ask Firefox to install the extension (which you will have to approve in Firefox). If this doesn't work, let me know and we can troubleshoot further.