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When installing Firefox on Windows 10, you may see a warning that says you can “only install apps from the Microsoft Store.” This is a Windows setting that blocks apps like Firefox from installing. Don't worry, you can quickly change this setting and continue with the installation.

Any Firefox download from www.mozilla.org or www.firefox.com 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.

What do I do if I don’t see the option to install anyway?

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. Windows may now allow it to install Firefox.