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need to get back to my firefox on my computer before installation of new version

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Hi need to get my old firefox back before installation of new version.

I have a subscription that allows for downloading of videos using a "DOWNLOAD" button that has disappeared after new version of firefox was loaded. also my antivirus application has disappeared. How do i put everything back the way it was. I'm using windows 10.

Please help

Hi need to get my old firefox back before installation of new version. I have a subscription that allows for downloading of videos using a "DOWNLOAD" button that has disappeared after new version of firefox was loaded. also my antivirus application has disappeared. How do i put everything back the way it was. I'm using windows 10. Please help

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During your update, did Firefox mention having to create a new profile or performing a Refresh/Tune-up?

Updating Firefox should not affect your antivirus application. You may want to investigate that first since it affects your entire system.