Examine source code of Beautiful Dark Wall

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "BeautifulDarkWall@Godie"
    }
  },
  "name": "Beautiful Dark Wall",
  "description": "Dark wall theme, between solid and fantastic.",
  "version": "1.3",
  "icons": {
    "32": "icon.svg"
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "wall.PNG"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ],
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    },
    "colors": {
      "frame": "#0d1117",
      "tab_background_text": "#bbc1c9",
      "frame_inactive": "#12161c",
      "toolbar": "#151013bc",
      "toolbar_text": "#b7bec8",
      "toolbar_field": "#151013bc",
      "toolbar_field_text": "#b7bec8",
      "toolbar_top_separator": "#262c33",
      "toolbar_bottom_separator": "#0f0b0e",
      "bookmark_text": "#b7bec8",
      "toolbar_field_border": "#30363d70",
      "toolbar_field_focus": "#221b20fc",
      "toolbar_field_border_focus": "#c73f38b0",
      "toolbar_field_highlight": "#b33932",
      "toolbar_field_highlight_text": "#ffffff",
      "toolbar_field_text_focus": "#b7bec8",
      "toolbar_vertical_separator": "#30363d",
      "button_background_hover": "#4b434a90",
      "button_background_active": "#4b434a",
      "icons": "#a9b2bc",
      "icons_attention": "#c73f38",
      "ntp_background": "#140f13",
      "ntp_text": "#e4e8ec",
      "ntp_card_background": "#2c2129",
      "popup": "#221b20",
      "popup_text": "#e4e8ec",
      "popup_border": "#5a535a70",
      "popup_highlight": "#b33932",
      "sidebar": "#221b20",
      "sidebar_text": "#b7bec8",
      "sidebar_border": "#0f0b0e",
      "sidebar_highlight": "#c73f3870",
      "sidebar_highlight_text": "#fefefe",
      "tab_selected": "#151013bc",
      "tab_line": "#c73f38",
      "tab_loading": "#3f84e4",
      "tab_loading_inactive": "#3f84e490",
      "tab_text": "#fefefe",
      "tab_attention_dot": "#3f84e4"
    }
  }
}