#!/usr/bin/env ruby
# curtab55 - print the currently selected Firefox 55 tab

require 'rubygems'
require 'json'

session = JSON.load(File.read(Dir[
   File.expand_path("~/.mozilla/firefox/*.default/sessionstore-backups/recovery.js"
   )].first))

window = session["windows"][session["selectedWindow"]-1]
tab    = window["tabs"][window["selected"]-1]
page   = tab["entries"][tab["index"]-1]

puts page["url"]