OS: latest updated Windows 10 x64

Firefox: 60.0.2 x64

Addon: 66.1.8

For some reason in my case it has exactly no effect if I uncheck exact the thing shown in your screenshot, quickmenu will still be shown on mouse over a tile. If I can help you somehow to work on this just let me know, e.g. giving you details to my firefox version, taking screenshots and so on. Appart from this little thing you did a nice job, keep up the good work! Thanks in advance,

EvilEd