Examine source code of Eternal Domains

{
  "name": "Eternal Domains",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Astra - II.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 0)",
      "tab_background_text": "rgba(89, 75, 219, 0.89)",
      "toolbar": "rgba(41, 22, 135, 0.34)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.21)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(89, 75, 219, 0.34)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{932206a1-91b9-44b6-adbd-19064e45fb51}"
    }
  }
}