Examine source code of Heilung Runes

{
  "name": "Heilung Runes",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "HeilungRuneSwirl.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(38, 32, 28, 0.46)",
      "bookmark_text": "rgba(107, 128, 105, 1)",
      "toolbar_field": "rgba(128, 119, 110, 1)",
      "toolbar_field_text": "rgba(41, 30, 30, 1)",
      "tab_line": "rgba(81, 97, 86, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cf2ca104-ca0b-4eb4-8bd5-35f7b9e0caac}"
    }
  }
}