Very useful add-on. I use it all the time. No problems!

Perfection.

Almost perfect for its purpose. I would ask for the ability to change the color of the icon to match the theme.

Simple an effective, it gives me a single place to easily and quickly click for closing the current tab. Plus, it's a pale color and works nicely with my darker shade Firefox theme.

It takes brains to be simple

This close button doesn't follow pinned tab, so the pinned tab will be closed even it's pinned.

Can't imagine life without this addon. Thank you so much. I have used it for years now! I love having a few close buttons for easy access

Works. Put a very light gray cross icon (the icon is different from the addon icon, and no screenshot is provided), the icon sits next to the URL bar, one click and the current tab is closed.
But for visual reasons, I prefer Close tab context menu, that shows a bigger, dark, black icon.

The icon should be customizable, it would be better, or less difficult to see. This addon is for people who has few icons in the bar, or want a very unobtrusive icon.

@Andralon No screenshot is not good for users, but it's never a reason for a one star review!!!!

simple, clear, works

Tested with Firefox 60.0.2 x86.

Very interesting!

Thanks amokk.

Yeah! Back to user friendly interface!

P.S. And I agree with raveren, about the simple cross icon.

Does the job, however the icon is not the best choice IMO, why not go with a classic X:

https://raw.githubusercontent.com/tynn/close-tab-button/master/icon.png