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Firefox Developper Edition is preventing my mac from sleeping

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I'm having this recent problem with Firefox Developper Edition. When I watch videos online, my Mac won't go to sleep even once the streaming is over. It's normal that the browser prevents the mac from sleeping while the video is on but I'm trying to understand why it doesn't let it sleep even when the video reaches to an end. I've tested it with the Opera browser and it doesn't do this. When I look in the Activity Monitor it shows that only processes coming from the Firefox browser are doing this. How can I fix this issue? I've tried deleting my cache and history, scanning my computer multiple times for any kind of malware, updating the browser... I have a Macbook Pro late 2013 and I'm running Yosemite. Any help on the issue would be really appreciated...

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Here is a screenshot of my Activity Monitor if that is of any help.