Miss having that close button on your last open tab in Firefox?
Miss it no longer, because of the help of a creative add-on writer and – well, yeah that is it. The Last Tab Close Button add-on for Firefox will show the close button on the last tab in Firefox, which closes that specific tab, and not the entire browser.
This seems to be a functionality that some were missing, so happy to see it back (for those who might need it). You can pick up the Last Tab Close Button add-on for Firefox, on the Firefox Add-ons web site.