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I do have McAfee LiveSafe and McAfee WebAdvisor that was pre-installed on my laptop, though.
That must have installed an add-on in Firefox.
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Was the windows firewall replaced with windows defender firewall with builds 1703 and later?
YES. It's the same thing, just renamed.
https://windowsreport.com/windows-de...eators-update/
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Microsoft will ‘retire’ the famous Windows Firewall, and change its name to Windows Defender Firewall in the Fall Creators Update.
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I assume if I uninstall LiveSafe, I will be able to turn the windows firewall on. What would be my best option? Should I uninstall LiveSafe since the trial version has expired or just leave it and continuing using McAfee firewall?
I would uninstall Mcafee. You are already using Avast anyway. The Windows Firewall should be re-enabled after that. If not, just enable it.