The new 9-window tab, disappears after half a second!?

When I open a new tab, firefox (sometimes) let's me see a window with 9 suggested homepages, I think it's the 9 homepages I use the most. I would really love to have that feature, but unfortunatly I can only see it for half a second, and then it changes to that original New Tab with a Lens and a search bar. What can I do to make it stay?

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