Examine source code of Visionary – Soft

{
  "manifest_version": 2,
  "name": "Visionary – Soft",
  "author": "Mozilla",
  "version": "2.1",
  "icons": {
    "32": "icon.svg"
  },
  "theme": {
    "colors": {
      "tab_background_text": "hsl(48, 10%, 10%)",
      "tab_text": "hsl(48, 10%, 10%)",
      "tab_selected": "hsl(140, 60%, 98%)",
      "tab_line": "transparent",
      "tab_loading": "hsl(144, 70%, 21%)",
      "frame": "hsl(147, 53%, 75%)",
      "popup": "hsl(140, 60%, 98%)",
      "popup_text": "hsl(48, 10%, 10%)",
      "popup_border": "hsl(147, 89%, 22%)",
      "popup_highlight": "hsla(147, 54%, 52%, 0.3)",
      "popup_highlight_text": "hsl(48, 10%, 10%)",
      "toolbar": "hsl(146, 49%, 85%)",
      "toolbar_text": "hsl(48, 10%, 10%)",
      "toolbar_field": "hsl(147, 53%, 75%)",
      "toolbar_field_text": "hsl(48, 10%, 10%)",
      "toolbar_field_focus": "hsl(140, 60%, 98%)",
      "toolbar_field_border_focus": "rgba(0, 96, 223, 0.5)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "hsl(147, 53%, 75%)",
      "ntp_background": "hsl(148, 100%, 97%)",
      "ntp_card_background": "hsl(140, 60%, 98%)",
      "ntp_text": "hsl(48, 10%, 10%)",
      "sidebar": "hsl(140, 60%, 98%)",
      "sidebar_text": "hsl(48, 10%, 10%)",
      "sidebar_highlight": "hsla(147, 54%, 52%, 0.3)",
      "icons_attention": "hsl(144, 70%, 21%)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "visionary-soft-colorway@mozilla.org"
    }
  }
}