Examine source code of Dark green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(1, 29, 9)",
      "toolbar_field_text": "rgb(249, 249, 253)",
      "tab_line": "rgb(7, 102, 17)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(14, 132, 30)",
      "button_background_hover": "rgb(5, 48, 10)",
      "icons_attention": "rgb(0, 255, 32)",
      "ntp_background": "rgb(2, 25, 2)",
      "ntp_text": "rgb(184, 255, 184)",
      "popup_border": "rgb(1, 108, 14)",
      "popup_highlight": "rgb(12, 155, 28)",
      "sidebar_border": "rgb(0, 255, 28)",
      "sidebar_highlight_text": "rgb(199, 255, 205)",
      "sidebar_highlight": "rgb(3, 101, 14)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(1, 29, 9)",
      "tab_loading": "rgb(4, 240, 30)",
      "tab_selected": "rgb(4, 23, 7)",
      "tab_text": "rgb(16, 202, 37)",
      "toolbar_bottom_separator": "rgb(1, 29, 9)",
      "toolbar_field_border_focus": "rgb(4, 159, 8)",
      "toolbar_field_border": "rgb(0, 49, 1)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(19, 125, 2)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a801960e-718f-4adb-9b22-752861b9e2da}"
    }
  }
}