User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0 Build ID: 20160105164030 Steps to reproduce: 1. Open several windows 2. Close Firefox 3. Open Firefox and restore season Actual results: Each time I got windows restored in random order -- this has been an issue for a while but wasn't like that in the older Firefox versions (unfortunately I cannot state when it started but perhaps around year or even more ago). Expected results: This is quite annoying as I am using the browser actively and tend to organize my windows according to importance and ease of clicking. Luckily the tabs get restored in the right order.