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copied!<p>As far as I can tell, both Chrome and Firefox Speed-dial thumbnails are only populated when you visit a page - i.e. they're taken from the normal browsing context, with normal headers, rather than being independently queries in their own right.</p> <p>You can test this a number of ways - I haven't spent long testing it, and you may have different version(s) of Firefox/Chrome than I do so you may see different results.</p> <ol> <li>In <strong>Chrome</strong> - pin a tab or two in Speed-dial and then empty your browser history. The thumbnails should disappear until you re-visit the pinned page.</li> <li><p>In <strong>Firefox</strong> - the above works, but you can also try out thumbnail generation directly using the <em>moz-page-thumb://</em> URL protocol:</p> <p>moz-page-thumb://thumbnail?url=http%3A%2F%2Fstackoverflow.com%2Fq%2F10369905%2F210865"</p></li> </ol> <p>(please do test in whatever versions you're running as I'm curious about this question too - my research sofar is disappointing, but possibly in future ...)</p> <p>Other references:</p> <ul> <li><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=497543" rel="nofollow noreferrer">Original bugzilla entry for adding thumbnails to FF Speed-dial</a></li> <li><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=721398" rel="nofollow noreferrer">Another bugzilla entry on fixing thumbnail protocol security issues</a></li> <li><a href="https://superuser.com/q/205178">Related Super User question</a></li> </ul>

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