Z 3 z 5 hwěžkow pohódnoćeny

wot fishlevel dnja Meja 18, 2020 · trajny wotkaz

It seems like this add-on actually searches for the "Tools" menu label. In other languages the label is of course different, e.g. "Extras" in German. This means that it does not work unless the Thunderbird language is set to English!