osx 10.9.5
Firefox 39.0
Firebug 2.0.11

While working on a recent project, I started noticing some strange 
behavior. Certain actions were happening twice, getting logged twice, etc., 
despite knowing that I only performed them once. I primarily develop on 
Firefox, and always have an eye on my Firebug network console. My site 
performs a lot of ajax calls. While testing, the network console never 
reveals that an API was called twice in a row. However, the end result in 
my system was that it was called twice.

I assumed something was wrong with my code, or that 2 calls were being made 
immediately (user or UI implementation error), and that because of the 
immediate chaining of calls, Firebug was only displaying one of them. This 
is not the case, sadly. Testing in other browsers, I do not have the 
problem. Testing with Firebug closed, I do not have the issue.

Fortunately, most end users do not have firebug open, and in my particular 
case, the impact of this happening in production would be limited. Still, 
this is bad. Can anyone else reproduce this? Remember, the network console 
will show no proof. You would need to verify the multiple API calls from 
API server. It's as if the 2nd call happens, but the browser has no 
awareness of it.

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