Examine source code of Gimp rules

{
  "theme": {
    "images": {
      "theme_frame": "The_Gimp_Header.png"
    },
    "colors": {
      "frame": "#fffac4",
      "tab_background_text": "#00000a"
    }
  },
  "version": "2.0",
  "name": "Gimp rules",
  "manifest_version": 2,
  "description": "Wilbur the GIMP free open source image editing is the best. Thanks for everything <a href=\"https://outgoing.prod.mozaws.net/v1/cf03bf9032d386db068ea57b12d5607a80d4b387b3e6d1241865c4d6845b79fb/http%3A//GIMP.org\" rel=\"nofollow\">GIMP.org</a>"
}