Examine source code of Rimi's Theme

{
  "name": "Rimi's Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Wollkleid-Fluss-1-hp-768x1024_Fotor.jpg"
    },
    "colors": {
      "frame": "rgba(232, 233, 235, 1)",
      "tab_background_text": "rgba(51, 122, 65, 1)",
      "toolbar": "rgba(255, 255, 255, 0.22)",
      "bookmark_text": "rgba(82, 55, 34, 1)",
      "toolbar_field": "rgba(31, 87, 30, 0.29)",
      "toolbar_field_text": "rgba(10, 51, 17, 1)",
      "tab_line": "rgba(102, 66, 16, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ef2d4ec2-f168-42a3-9cb8-04f4cb41aff0}"
    }
  }
}