Examine source code of Bright summertime green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Spring green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(1, 249, 107, 0.15)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(3, 252, 251)",
      "tab_background_text": "rgb(213, 255, 29)",
      "toolbar_field": "rgb(56, 204, 35)",
      "toolbar_field_text": "rgb(1, 1, 1)",
      "tab_line": "rgb(2, 126, 1)",
      "popup": "rgb(151, 253, 133)",
      "popup_text": "rgb(10, 7, 190)",
      "button_background_active": "rgb(113, 131, 254)",
      "button_background_hover": "rgb(113, 230, 254)",
      "ntp_text": "rgb(186, 131, 254)",
      "popup_border": "rgb(13, 254, 254)",
      "tab_loading": "rgb(2, 126, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d46edfff-31a1-4ed5-b936-3ac320a1770a}"
    }
  }
}