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In certain versions of Windows 10, you may receive a notification with a warning about Microsoft-verified apps when you run the Firefox installer.

Any copy of Firefox downloaded from www.mozilla.org is safe to install, so choose Install anyway.

Note:

You can also download and install Firefox from the Microsoft Store.
Using Windows 10 in S mode? See Windows in S mode won't let me install Firefox.

If you do not see the option to Install anyway, follow the steps below to change your system settings.

Open the Windows 10 Start menu and select Settings.
Click on Apps in the Windows Settings menu.
In the Apps & features section, go to Choose where to get apps, click on the dropdown menu below and select one of the options that allows you to install from Anywhere.
Run the Firefox Installer again. Your Windows may now allow it to install Firefox.