Rated 4 out of 5 stars
Cool! For me this was the last piece of the puzzle to getting a good UI again after the Australis mess. If I could have selected to add only the "close active tab" to the context menu without the other 2 entries it would be perfect.
That's a setting in about:config. Change "browser.tabs.closeButtons" to "1" should get you close buttons on each tab.