Examine source code of 61Gowi's Hexgrid

{
  "name": "61 Gowi's Hexgrid",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "header5.png"
    },
    "colors": {
      "frame": "rgba(232, 233, 235, 0)",
      "tab_background_text": "rgba(255, 168, 46, 1)",
      "toolbar": "rgba(16, 18, 38, 0.67)",
      "bookmark_text": "rgba(255, 168, 46, 1)",
      "toolbar_field": "rgba(10, 11, 23, 0.7)",
      "toolbar_field_text": "rgba(255, 168, 46, 1)",
      "tab_line": "rgba(255, 0, 128, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eca9ddca-ff7e-448c-94ed-27f5eab49eb0}"
    }
  }
}