Hi there, Here is how to change your default browser in Windows 10: Select the Start button, and then type Default apps. In the search results, select Default apps. Under Web browser, select the browser currently listed, and then select Firefox or another browser. (you do this by clicking on the browser shown and then a drop down list should appear of installed options) Mozilla VPN is a standalone app that you need to download on each device you want to protect. You can download the VPN directly from vpn.mozilla.org . There, you will be further prompted to log in to your Firefox account. Once you have downloaded the client, the installer should guide you through the remaining steps. Once you've installed the application, open the client (by searching for Mozilla VPN on your device), flip the switch to "On", and you're good to go! It will cover any internet activity on the device while the VPN is on, including your browsing activity. Mozilla VPN is currently only compatible with the following devices on these operating systems and versions: Windows 10 (64-bit only), macOS (version 10.15 and above), Linux (Ubuntu distributions only), Android (version 6 and higher), iOS (version 13.0 and above). Here is also an article on how to download it on each individual device: https://support.mozilla.org/en-US/kb/how-download-mozilla-vpn-your-desktop-or-mobile