Examine source code of Blocks by MaDonna

{
  "name": "Blocks by MaDonna",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(12, 21, 28, 0)",
      "tab_background_text": "#87ddf5",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(140, 228, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.05)",
      "toolbar_field_text": "rgba(252, 236, 171, 1)",
      "tab_line": "rgba(252, 236, 171, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24f37364-361b-4f23-a8f6-fb6e7b429dfa}"
    }
  }
}