Examine source code of Umberleaf Copperline

{
  "manifest_version": 2,
  "name": "Umberleaf Copperline",
  "version": "1.0",
  "description": "A warm umber and olive theme with paper texture and a copper diagonal accent for a premium, focused look.",
  "theme": {
    "images": {
      "theme_frame": "umberleaf_copperline_header.png"
    },
    "colors": {
      "frame": [
        40,
        28,
        18
      ],
      "tab_background_text": [
        252,
        248,
        240
      ],
      "toolbar": [
        66,
        54,
        36
      ],
      "toolbar_text": [
        252,
        248,
        240
      ],
      "tab_line": [
        200,
        140,
        90
      ],
      "bookmark_text": [
        246,
        240,
        232
      ],
      "toolbar_field": [
        82,
        68,
        46
      ],
      "toolbar_field_text": [
        252,
        248,
        240
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe63bfbd-0e77-4272-8c16-2e11429254a3}"
    }
  }
}