This extension I have defined as home page, this way I can reach it easily by pressing the Home button, or this is what I wanted because it has nothing easy. The URL that starts with "moz-extension://" and ends with "/newTab.xhtml" that I define as the home page changes constantly and there comes a time that does not load with the Home button, having to open a new tab and copy the URL again. With Firefox previous to Quantum it did not happen.
Before you could also reload the thumbnail and now this option is no longer available. Now it loads the miniatures it wants and the rest don't.
Can you fix it?
Sorry for the low rate, but this problem takes away a lot of usefulness. I know it's not your fault but the change to Quantum, but it's the way I have that you look at this query and try to fix it. When it is solved I will rate again with 5 stars.