[Solved] No thumbnails allowed for Firefox?

[Peter2]

Solved:
It was a problem of "redirection" - the link stored the address of "website A" which was a redirection to "website b". This is why the link worked, but had no thumbnail.
------------------------------------------------
I use Firefox and have "about:newtab" as starting page, "ahkscript.org" is one of the pages I have "pinned" on the starting-page.

The only problem is: the thumbnail is and stays empty. Firefox-help writes that "some webpages does not allow the creation of thumbnails": https://support.mozilla.org/en-US/kb/th ... -them-back

Is it possible that ahkscript.org is one of these sites?