Preview: Startpage & New Tab Page Firefox Windows

Note: there's a file config.json, instapaperURL is a website where I render the html of a column:

{
  "instapaperURL": "Z",
  "lastFMURL": "https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=X&api_key=Y&format=json&limit=1"
}