V. 2.2.7: Great addon that has now added "close tabs on the right" and "close tabs on the left", in its list of predefined actions.

CONS: these 2 actions work only on some pages. E.g., from the page I'm now writing this review it doesn't work (and it's not a matter of input field because I've put the focus on the page).

SUGGESTION: Maybe (or maybe not because that is button) in this open source addon
https://github.com/j70/multitabx
can be found the trick to improve this one, because that addon is working even from the about:addon page.