[Bug 366103]

[Unique-ek]

I can see that happening in;

Version 	52.0a1
Build ID 	20160919065232
User Agent 	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:52.0) Gecko/20100101 Firefox/52.0
OS 	Windows_NT 10.0

I'm not exactly sure how to replicate it, so I can't be sure if
disabling extensions solve the issue or not. It kinda happens at random.

However I do noticed that whenever I try to run Firefox the first time
after a boot, it just spawns a single process in task manager which gets
stuck at 2.5~ mb ram usage and stays like that forever, until I force
close and re-open it. Not sure if it has any relation to above issue.

also updated here: https://bugzilla.mozilla.org/show_bug.cgi?id=872033

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https://bugs.launchpad.net/bugs/366103

Title:
  Double-clicking Firefox launcher produces "Firefox is already running"
  error

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