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I ran a SmartScan this morning and it warned me that Firefox hadn’t updated itself. I had that resolved and downloaded a new Firefox installation just to be sure. After rebooting, Avast informed me that not all the Firefox files had been cleaned out, should it delete them. Thinking it meant files relevant to the old version, I told it to go ahead. It promptly deleted Firefox altogether.

I had to create an exception for it to install Opera, which I’m using at the moment. Is the current Avast only friendly to IE11? I’m running Windows 8.1, being unwilling to upgrade to Windows 10 just yet.

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hey and welcome to the forum. avast smart scan does not delete files that is linked to a browser, but it could be related to grimefighter but makes no seens either.

also you should not have to make an exepction in avast to install opera either.

small suggestion lets have a expert have look just in case

please follow this guide and attach the basic logs from mbam and frst+addation

https://forum.avast.com/index.php?topic=53253.0

good luck