Examine source code of Restful Reminder

{
  "name": "Restful Reminder",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "it-okay-to-take-a-break.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(242, 158, 158, 1)",
      "bookmark_text": "rgba(92, 89, 89, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{930bc146-7379-4ef2-b490-434b97c10b92}"
    }
  }
}