Examine source code of Forge Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Forge Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(31, 34, 61)",
      "toolbar_text": "rgb(95, 228, 243)",
      "frame": "rgb(3, 3, 20)",
      "tab_background_text": "rgb(148, 218, 225)",
      "toolbar_field": "rgb(19, 21, 31)",
      "toolbar_field_text": "rgb(0, 220, 255)",
      "tab_line": "rgb(0, 232, 255)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(138, 195, 201)",
      "tab_loading": "rgb(0, 232, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7070b0f3-6c7f-4fe8-85ee-eef3327b0053}"
    }
  }
}