Examine source code of Rainy Day Musts

{
  "name": "Rainy Day Musts",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "RainyDayMustsH.jpg"
    },
    "colors": {
      "frame": "rgba(237, 237, 234, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(240, 240, 237, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(240, 240, 237, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9fc12d18-1069-4c30-9e50-b86a3cfdde66}"
    }
  }
}