I was a long time "Close Tab Context Menu by Baris Derin" user, but it stopped working. I am not a fan of leaving bad rating for a person who helped me before, just because the help stopped...
Anyway - "close tab right click" is a great replacement.
The icon is not the most beautiful one, but the functionality is excellent!

Very helpful for my windows tablet when firefox is in fullscreen mode. Thanks kakakikikeke

Does what it says. I don't understand why something like this isn't a default option in all modern browsers, saves so much muscle power over the long term.