Examine source code of Abstract Background

{
  "name": "Abstract Background",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "1000057512.jpg"
    },
    "colors": {
      "frame": "rgba(90, 123, 199, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(29, 97, 145, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1f5e442-fb3b-42d4-a877-3cd0c018cdc9}"
    }
  }
}