I've uninstalled Firefox, but CCleaner still detect it

I use CCleaner 4.14.4707 and recently uninstalled Mozilla Firefox from my computer few days ago. I've just realized that when I open CCleaner, I still see a 'Firefox' section at the left sidebar of the app, and there's a Firefox tab (containing some entries) in the Startup list, though the Firefox itself had already been removed.

I try to clean registry using Wise, and re-install CCleaner, but those things still exist.

How can I remove them?

Firefox section is an option and only applied if you have Firefox installed. You can't remove it from CCleaner.

Options such as Firefox are hard coded into CCleaner and will always be present, even when run on a system in which Firefox has never been installed. These options cannot be removed. Please do not use any registry cleaner, even that in CCleaner. These things generally cause more problems than they solve. The benefits of regular registry cleaning are highly questionable.