Examine source code of Gold digger

{
  "name": "Gold digger",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "gold-digger-3.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(207, 207, 207, 1)",
      "toolbar": "rgba(0, 0, 0, 0.67)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(158, 158, 158, 1)",
      "tab_line": "rgba(76, 143, 75, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe2bc331-a37e-46e0-b15c-d90b38f04953}"
    }
  }
}