https://marco.org/2008/06/17/firefox-3-has-a-very-strange-text-encoding
Firefox 3 has a very strange text-encoding bug.
It rendered the substring o/ as ø, even though no character set was defined anywhere. Here’s the entire HTTP response:
HTTP/1.1 200 OK
Date: Tue, 17 Jun 2008 20:26:17 GMT
Content-Length: 128
Content-Type: text/html
Fatal error: Call to a member function whatever() on a non-object in /Users/marco/davidville/tumblr/lib/whatever.php on line 32
The Page Info dialog reports that Firefox is rendering in Quirks Mode and assuming the ISO-8859-1 encoding.
Looks like it’s mistakenly rendering composite glyphs.