Examine source code of Healthy Green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Healthy Green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(38, 67, 38)",
      "toolbar_text": "rgb(252, 255, 252)",
      "frame": "rgb(28, 44, 28)",
      "tab_background_text": "rgb(124, 172, 124)",
      "toolbar_field": "rgb(25, 49, 25)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(114, 149, 102, 0)",
      "popup": "rgb(165, 226, 165)",
      "popup_text": "rgb(43, 57, 43)",
      "button_background_active": "rgb(165, 226, 165)",
      "button_background_hover": "rgb(50, 98, 50)",
      "icons_attention": "rgb(255, 192, 0)",
      "icons": "rgb(117, 173, 117)",
      "ntp_background": "rgb(25, 49, 25)",
      "popup_border": "rgba(255, 255, 255, 0)",
      "popup_highlight": "rgb(46, 128, 46)",
      "sidebar": "rgb(255, 192, 0)",
      "tab_loading": "rgb(252, 255, 252)",
      "tab_text": "rgb(253, 253, 253)",
      "toolbar_bottom_separator": "rgba(25, 49, 25, 0)",
      "toolbar_field_border_focus": "rgb(42, 97, 42)",
      "toolbar_field_border": "rgba(252, 252, 252, 0)",
      "toolbar_field_focus": "rgba(28, 44, 28, 0.24)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(165, 226, 165, 0.2)",
      "toolbar_top_separator": "rgba(46, 128, 46, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81a6dbf7-d3ec-4b57-a7cd-efa6c1680820}"
    }
  }
}