Examine source code of blue notes

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxHeader05.jpg"
    },
    "colors": {
      "frame": "#1275e0",
      "tab_background_text": "#2027ab"
    }
  },
  "version": "2.0",
  "name": "blue notes",
  "manifest_version": 2
}