CloseSign per grue

Instead of seeing the return button many times.
It helps you to decide whether you can return from the current page that is no longer needed or just close it.

Customize:
For the two situations, the first page at the time of tab creation and the other pages, you can set the color for the mark.
Three of them can be used as a marker: toolbar icon, address bar icon and theme.

Attention:
It does not fully support the restored tab and the page with frame structure.
When changing the theme, it can not be used with other themes.