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由 Steve 发表于 Jan. 21, 2010 · 永久链接

Ubuntu 9.10 (Karmic Koala)
Firefox 3.5.7 (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.7) Gecko/20100106 Ubuntu/9.10 (karmic) Firefox/3.5.7 GTB6)

tooltip on xkcd still disappears after ~1 sec. :-(