Are thumbnails saved somewhere?

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http://www.linuxquestions.org – Hey I use Slackware 13.1 and browsing with Firefox. When I browse a site, and there are some image thumbnails which I don't open, are these "un-clicked" thumbnails saved somewhere in my computer after I shut down my system? Also, even if I actually click a thumbnail to view the image full-size, is this image saved somewhere (like a temp or something) after I turn off my laptop? Cheers (HowTos)