Examine source code of Summer Sunflower v2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Summer Sunflower",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(244, 214, 96, 0.05)",
      "toolbar_text": "rgb(88, 151, 223)",
      "frame": "rgb(249, 243, 117)",
      "tab_background_text": "rgb(240, 40, 183)",
      "toolbar_field": "rgba(249, 243, 117, 0.5)",
      "toolbar_field_text": "rgb(116, 169, 40)",
      "tab_line": "rgb(255, 51, 51)",
      "popup": "rgb(252, 247, 183)",
      "popup_text": "rgb(255, 51, 51)",
      "button_background_active": "rgb(249, 243, 117)",
      "icons_attention": "rgb(117, 241, 249)",
      "icons": "rgb(240, 40, 183)",
      "ntp_background": "rgb(253, 238, 249)",
      "popup_border": "rgb(116, 169, 40)",
      "sidebar_border": "rgb(255, 51, 51)",
      "sidebar_highlight": "rgb(240, 40, 183)",
      "sidebar_text": "rgb(255, 51, 51)",
      "sidebar": "rgb(252, 227, 245)",
      "tab_text": "rgb(116, 169, 40)",
      "toolbar_bottom_separator": "rgb(116, 169, 40)",
      "toolbar_field_border_focus": "rgb(240, 40, 183)",
      "toolbar_field_border": "rgb(88, 151, 223)",
      "toolbar_field_focus": "rgb(250, 248, 202)",
      "toolbar_field_highlight_text": "rgb(249, 243, 117)",
      "toolbar_field_highlight": "rgb(255, 51, 51)",
      "toolbar_top_separator": "rgb(240, 40, 183)",
      "tab_loading": "rgb(255, 51, 51)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{29f77ab8-4f9b-470a-b214-c22b5c134551}"
    }
  }
}