1. load mozilla
2. type data:text/html,&#xUUUU; into the location bar where UUUU is the
   codepoint you want to encode
3. copy the result to the clipboard
4. type data:,<paste> into the location bar again
5. press enter
6. the UTF-8 encoded string is in the location bar, and is shown as
   ISO-8859-1 bytes in the content area.