Examine source code of SpiderMan by M♥Donna

{
  "name": "SpiderMan by M♥Donna",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "SpiderMan2.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(255, 255, 255, 0)",
      "bookmark_text": "rgba(40, 48, 59, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.12)",
      "toolbar_field_text": "rgba(40, 48, 59, 1)",
      "tab_line": "rgba(194, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{92db90ed-1df0-48f0-9a5a-f8d60ac93dae}"
    }
  }
}