Examine source code of GraySand

{
  "name": "GraySand",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(172, 189, 183, 1)",
      "tab_background_text": "rgba(32, 34, 20, 1)",
      "toolbar_field": "rgba(248, 249, 250, 1)",
      "toolbar_field_text": "rgba(32, 34, 20, 1)",
      "tab_line": "rgba(170, 187, 181, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f60a4eed-2c00-4b9b-adfd-626605a1670e}"
    }
  }
}