Examine source code of Rainbow Mosaic

{
  "theme": {
    "images": {
      "theme_frame": "rainbowmosaic.png"
    },
    "colors": {
      "frame": "#fc9700",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Rainbow Mosaic",
  "manifest_version": 2,
  "description": "I made an overlapping rainbowsquare piece. That i thought looked like a rainbow mosaic. This brightens up my firefox and i hope it does to yours to."
}