It's a great tool, thank you. But you could make the "user guide" more simple, for me also it took a while to make it work. I suggest a paragraph like this:

"HOW TO USE IT

1. Click on the Sidebar icon.
2. Go to the Sidebar panel on the left.
3. Click Play, if you simply want to update all your favicons.
4. Click Question mark, if you want more information or use other features.

Cheers,

Jussi