Examine source code of Purple flavour

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple-ish",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(233, 228, 238, 0.87)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(218, 207, 249)",
      "tab_background_text": "rgb(0, 4, 0)",
      "toolbar_field": "rgb(29, 29, 44)",
      "toolbar_field_text": "rgb(198, 250, 147)",
      "tab_line": "rgb(99, 117, 99)",
      "popup": "rgba(233, 228, 238, 0.87)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_hover": "rgb(229, 189, 183)",
      "icons": "rgb(0, 0, 0)",
      "popup_border": "rgb(0, 4, 0)",
      "tab_selected": "rgb(229, 189, 183)",
      "tab_text": "rgb(9, 14, 20)",
      "toolbar_bottom_separator": "rgb(0, 8, 0)",
      "toolbar_field_border": "rgb(0, 8, 0)",
      "toolbar_top_separator": "rgb(0, 8, 0)",
      "tab_loading": "rgb(99, 117, 99)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d28f498-f7d0-44fb-a0dd-7916dffb4d21}"
    }
  }
}