Preview thumbnails on the page empty new tab only for some URLS

When I open a new tab, there are three some preview thumbnails that are always empty, and there is no way I can make them appear again. They didn't work at first, but at some point the three extracts disappeared and never returned.
I have already tried to empy cache and recharge sites as suggested here, but the thumbs are still empty. It's always the same three URLS where this happens. I have also erased from history, to open new sites and drag items in the history menu in a thumbnail - the same result.

You can open the Web Console (Web Developer > Web Console;) CTRL + SHIFT + K) and click on the entrance to the home page (index) to inspect the response headers.

You can reload webpages and ignore the cache to refresh all files.

  • Hold SHIFT and click reload.
  • Press 'Ctrl + F5' or 'Ctrl + Shift + R' (Windows, Linux)
  • Press 'Cmd + Shift + R' (MAC)

See also:

Tags: Firefox

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