Examine source code of Sleek Violet

{
  "name": "Sleek Violet",
  "author": "Luke P",
  "manifest_version": 2,
  "version": "2020.8.4.1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(53, 54, 58)",
      "toolbar_text": "rgb(241, 243, 244)",
      "frame": "rgba(32, 33, 36, 1)",
      "frame_inactive": "rgba(32, 33, 36, 1)",
      "tab_background_text": "rgb(213, 217, 221)",
      "toolbar_field": "rgb(32, 33, 36)",
      "toolbar_field_text": "rgb(250, 250, 251)",
      "tab_line": "rgb(132, 41, 206)",
      "popup": "rgb(41, 42, 45)",
      "popup_text": "rgb(227, 230, 233)",
      "tab_loading": "rgb(132, 41, 206)",
      "popup_highlight": "rgba(68, 69, 71, 1)",
      "toolbar_bottom_separator": "rgba(40, 40, 40, 1)",
      "toolbar_vertical_separator": "rgba(110, 112, 115, 1)",
      "tab_text": "rgba(252, 252, 252, 1)",
      "sidebar_text": "rgba(213, 217, 221, 1)",
      "toolbar_top_separator": "rgba(53, 54, 58, 1)",
      "button_background_hover": "rgba(68, 69, 73, 1)",
      "button_background_active": "rgba(79, 80, 83, 1)",
      "bookmark_text": "rgba(170, 170, 170, 1)",
      "popup_border": "rgba(18, 18, 18, 1)",
      "popup_highlight_text": "rgba(255, 255, 255, 1)",
      "ntp_background": "rgba(18, 18, 18, 1)",
      "ntp_text": "rgba(170, 170, 170, 1)",
      "sidebar": "rgba(35, 35, 35, 1)",
      "sidebar_border": "rgba(18, 18, 18, 1)",
      "sidebar_highlight": "#21252B",
      "sidebar_highlight_text": "rgba(170, 170, 170, 1)"
    }
  }
}