Inactive (grayed out) thumbnails in New Tab. I have 6 in use, 3 grayed out.

Inactive (grayed out) thumbnails in New Tab.
I have 6 in use, 3 are grayed out. I tried dragging a bookmark into the thumbnail but that actually opens the website instead of fixing the thumbnail. How do I activate these grayed out thumbnails? Firefox 29. Windows7. Thank you.

The thumbnails are generated from the disk cache, so make sure that the cache is enabled and working and that you do not use "Clear history when Firefox closes" to clear the cache as this disables the disk cache (see about:cache).
Note that pages loaded via a secure HTTPS link aren't showing on the about:newtab page and also pages that aren't in the cache for some reason (they may be sending no-cache headers; see Tools > Page Info > General) have no thumbnails.

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