I use a MacBook Pro with MacOS 10.11 and the latest version of FireFox (72.0.2) and I'm unable to figure out how to close multiple tabs at once. With past versions of FireFox, I could bring up the context menu (by holding down the control key and clicking on a tab) and choose "Close other tabs" or choose "Close tabs to the right of this tab." I could also choose either option from the File menu, but all those options seem to be gone now and I can't even bring up the Context menu any more. Maybe if I had a two-button mouse, I could click the right button, but you should be able to do the same thing with the standard trackpad that comes with the MacBook. I'm sorry. Anyway, how do you close multiple tabs? Thank you so much.