In many cases, the program icon is actually bundled right into the EXE file, so Windows should have no issue finding it.

I'm not sure if you've already done this or not, but try restarting the computer (by actually selecting restart, not shut down). This often forces Windows 10 to find the icon again and usually fixes this type of issue.

Thanks for the reply. Restarting the computer or powering up from a total shutdown do not fix the problem/return the icon.

Is the icon pinned to your taskbar?

Try right clicking the icon and selecting Unpin from taskbar. Then close Firefox and open Firefox again (if you can't find it, select it from the apps in the Windows start menu). Then right click the icon again and select Pin from taskbar.

Wow, that at least generated another unique situation. When I unpinned it from the Taskbar while it was open, the Firefox icon materialized in the Taskbar but when I closed the active window, it as it should, disappeared from the Taskbar. I then searched for and found Firefox in the Search Bar on the Taskbar and the icon was a white sheet of paper. I still pinned it to the Taskbar and it materialized as a white sheet of paper again. Then, opened it, unpinned it from the Taskbar and the Firefox icon materialized again. When closing the app, it removed from the taskbar again. Looks like when adding it to the Taskbar, it's looking for the icon in a specific location, not finding it, and placing a white sheet. My guess is that I need to find the exact location/folder of the Taskbar icons or where an app is calling its icon from when posting/pinning it to the Taskbar. Thanks for this is shed some additional light/clarification on the problem.