Examine source code of Floe from Waterfox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Floe for Firefox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(83, 83, 95)",
      "frame": "rgb(212, 212, 215)",
      "tab_background_text": "rgb(84, 84, 84)",
      "toolbar_field": "rgb(227, 227, 230)",
      "toolbar_field_text": "rgb(83, 83, 95)",
      "tab_line": "rgba(255, 66, 205, 0)",
      "popup": "rgb(252, 252, 254)",
      "popup_text": "rgb(84, 84, 84)",
      "button_background_active": "rgb(218, 239, 248)",
      "ntp_background": "rgb(240, 240, 243)",
      "popup_border": "rgba(30, 53, 63, 0)",
      "sidebar_border": "rgb(186, 186, 190)",
      "sidebar_text": "rgb(3, 142, 206)",
      "sidebar": "rgb(227, 227, 230)",
      "tab_loading": "rgb(3, 142, 206)",
      "tab_text": "rgb(3, 142, 206)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_border_focus": "rgb(3, 142, 206)",
      "toolbar_field_border": "rgba(35, 35, 87, 0)",
      "toolbar_top_separator": "rgba(3, 142, 206, 0)"
    }
  }
}