Examine source code of Colors Changing

{
  "name": "Colors Changing",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "ColorsChangingHcopyCustom.jpg"
    },
    "colors": {
      "frame": "rgba(235, 222, 103, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(235, 224, 101, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(235, 224, 101, 0.07)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f5cc1e3-35d2-4275-84a0-c8fbc998d752}"
    }
  }
}