It is best to try the online demo of FOX at http://fox.aksw.org
Currently, FOX only allows POST so the API can not be called within the browser but only with curl:
curl -d "type=TEXT&nif=TRUE&task=NER&output=TURTLE&text=My%20favorite%20actress%20is%20Natalie%20Portman!"
|Status||implements some features of NIF-1.0, but: GET is missing, ‘input-type’ is ‘type’|
RDF | JSON | N3 | NTriples