Because the conversion from the http/browser default encoding (windows 1252) to utf8 is lossy, the only way I can see to force UTF8 encoding is to re-request the resource and overriding the mimetype.
If the interest arises can add support for other encodings, but sticking to utf8 for now.
On another branch I have a rough implementation of being able to toggle between the encodings (similar to the 'raw' button) however I don't know how useful this would actually be.
Fixes #146
Because the conversion from the http/browser default encoding (windows 1252) to utf8 is lossy, the only way I can see to force UTF8 encoding is to re-request the resource and overriding the mimetype.