Examine source code of Gradient Minimalist

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gradient Minimalist ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(44, 198, 49, 0.61)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(39, 137, 21)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(77, 160, 26, 0.41)",
      "toolbar_field_text": "rgb(255, 249, 251)",
      "tab_line": "rgb(37, 144, 35)",
      "popup": "rgb(102, 219, 99)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(34, 115, 32)",
      "tab_loading": "rgb(37, 144, 35)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0ec80c4-8f41-41fc-9d0f-72b9a38d1bc0}"
    }
  }
}