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What is the file JJfb4Yxm.htm that Mozilla Firefox downloaded without my permission?

Making moves

Today when running the fourth update in five days with Mozilla Firefox, the JJfb4Yxm.htm file was automatically downloaded without my permission.
Since then my network is completely unstable, I can't access websites, Mozilla and Microsoft are not ready to give any kind of support or help, at least explain what the JJfb4Yxm.htm file is that they placed on my computer without any permission .
Does anyone here know what this file is that Windows Defender considered a virus and came directly from the Mozilla Firefox update?