Examine source code of February Hearts

{
  "theme": {
    "images": {
      "theme_frame": "feb1copy.jpg"
    },
    "colors": {
      "frame": "#eb3434",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "February Hearts",
  "manifest_version": 2,
  "description": "Hearts on a red background for February."
}