Comment 15 for bug 217154

Happened to me today with http://ant.apache.org/ (though not https://ant.apache.org/ which works fine). Clearing FF cache did not help. Googling however turned up a partial workaround: press Ctrl-F5. Have to press this on every page on the site I visit before it will be displayed, and even then it is not guaranteed to work. Pages display fine in links.

[Reference: http://mail-archives.apache.org/mod_mbox/ant-dev/201002.mbox/browser and search for "http://ant.apache.org/ broken in FF" (not archived yet as of this writing)]