I tried reproducing this behavior on a PC by downloading and installing Firefox on a PC running the Windows 10 April 2018 Update version 1803, the latest public release. It installed without any interference. Next, I switched to a virtual machine running a recent Insider preview build of Windows 10, where I was able to reproduce this behavior. For good measure, I tested the installers for both Firefox and Chrome and received this warning each time. The wording of the dialog box looks like it was...

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