Examine source code of Fox Under Northern Lights

{
  "manifest_version": 2,
  "name": "Fox Under Northern Lights",
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#020810",
      "tab_background_text": "#40b888",
      "toolbar": "#040c14",
      "toolbar_text": "#50c898",
      "tab_selected": "#082818",
      "tab_line": "#209868",
      "toolbar_field": "#061018",
      "toolbar_field_text": "#50c898",
      "toolbar_field_border": "#105838",
      "icons": "#30a878",
      "icons_attention": "#80f0c0",
      "button_background_hover": "#0a1e14",
      "button_background_active": "#209868",
      "popup": "#040c14",
      "popup_text": "#50c898",
      "popup_border": "#105838",
      "sidebar": "#020810",
      "sidebar_text": "#40b888",
      "sidebar_border": "#105838",
      "ntp_background": "#020810",
      "ntp_text": "#40b888"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fox-under-northern-lights@foxkeh.theme"
    }
  }
}