Unfortunately, in an effort to move people to their recently redesigned browser, Microsoft did reset the default internet browser for some users in a Windows 10 update. However, Firefox is likely still installed on your computer. It's just not the program that opens when you want to browse the internet. The default internet browser can be changed from the Windows 10 settings screen. To do that, right click on the Windows start icon in the bottom-left of your screen and select '''Settings'''. On the settings page, select '''Apps'''. On the left sidebar, you should see '''Default Apps''' listed there. When you click on there, you should see '''Web Browser''' listed as a default application with Microsoft Edge selected. If you click on it, Firefox or Mozilla Firefox should be listed as an option to change to. Hope this helps and thanks for sticking with Firefox!