Examine source code of Blue clouds theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue cloud",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 31, 188)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 20, 146)",
      "tab_background_text": "rgb(20, 179, 114)",
      "toolbar_field": "rgb(12, 13, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 68, 255)",
      "popup": "rgb(0, 31, 188)",
      "popup_text": "rgb(253, 253, 253)",
      "tab_loading": "rgb(0, 68, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a9b43c9-881a-4128-950c-deb393dc5a0b}"
    }
  }
}