Don't work foxytab

FF : 58.0.2/64bit
clear uninstall(all ‘mozila’ folder = del) and reinstall FF.
and first(and only) install extension foxytab.
but context menu is nothing.
counter and world time is working in foxytab.
foxytab uninstall and reinstall. but, not working…
what’s problem?

Please post your questions to
https://discourse.mozilla.org/t/support-foxytab/

Have you right-clicked on the Tab (not the page)?

Oh my god. I did not know about it at all. I thought it was only on the page. Thank you very much.