I-Firefox Isithangami Sokwesekwa

Hello, I have a problem with your browser. I can't uninstall it. When i'm clicking uninstall in control panel (when firefox 59 is selected) nothing happening. Even if i try to do it manual by going into C:\Program Files\Mozilla Firefox\uninstall and clicking helper.exe (same when i run it as administrator). I was trying to do it to by CCleaner but with same results. I can start this browser, watch videos etc. but can't uninstall it. What's wrong?

Recent problems made it necessary to reset Firefox 62.0.3 to its defaults. Unfortunately, did not realize this included automatic update installs which I never allow. When Firefox was launched this A.M. 63.0 was automatically installed and, unfortunately, has some kind of bug causing video flickering. Tried to uninstall by simply deleting the program, but Firefox continues to operate under 63.0 and will not uninstall even though program was deleted and trash emptied (Mac).

Could someone please explain why this is occurring and how to get rid of it?

Thanks.

When I uninstall FF and then reinstall the latest FF 63.0 on the latest Windows 10 Pro, I notice it is added to Control Panel -> Apps -> Apps & Features, but it is NOT listed as a choice under Apps-> Default Apps -> Web Browser or under Default Apps -> Set defaults by app or Default Apps -> Choose default apps by protocol or Default Apps -> Choose default apps by file type. As a result, I am unable to set FF as the default browser.