Examine source code of Dark_shades

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#d68585"
    }
  },
  "version": "2.0",
  "name": "Dark_shades",
  "manifest_version": 2,
  "description": "This is a dark firefox persona which was created as a supportive act for a wallpaper series called shades of erosion which is already partially published on my webisite. One further firefox persona related to the overall series is also coming soon."
}