Examine source code of volkov

{
  "name": "volkov",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "volkov.png"
    },
    "colors": {
      "frame": "rgba(36, 31, 49, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(61, 56, 70, 0.6)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(36, 31, 49, 1)",
      "toolbar_field_text": "rgba(220, 138, 221, 1)",
      "tab_line": "rgba(169, 0, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3120718b-0fd7-4a8a-952a-b71ebc645bad}"
    }
  }
}