Examine source code of Kozak Custom

{
  "name": "Kozak Custom",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(20, 20, 20, 1)",
      "tab_background_text": "rgba(245, 245, 245, 1)",
      "toolbar": "rgba(20, 20, 20, 1)",
      "bookmark_text": "rgba(245, 245, 245, 1)",
      "toolbar_field": "rgba(35, 35, 35, 1)",
      "toolbar_field_text": "rgba(245, 245, 245, 1)",
      "tab_line": "rgba(35, 35, 35, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6011a7a3-7ef7-44ab-a819-d4382f3b8e01}"
    }
  }
}