Created attachment 8572601 [details] Screen Shot 2015-03-04 at 14.47.57.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150302192546 Steps to reproduce: When you wanna watch a YouTube video in full screen mode it should create a new desktop for just the video and let you keep on using your Firefox. Actual results: The whole program goes full screen mode and you can't open other tab, so you have to create a new window if you want to use Firefox. Expected results: The browser shouldn't go in full screen mode at all, just the video like in Safari (and if it was possible, it should allow you to navigate through the page). Firefox should only go full screen mode if you click on the green button. What Safari does: http://i.imgur.com/UJZZgWH.png Non-full-screened window with a full screen video in the actual tab. Allows you to keep on using the same window. You can't navigate through the page with a full screen mode. What Firefox does: http://i.imgur.com/CCrDsT5.jpg Full screened completely. You can't use the window from where you created the full screen instance, so you need a new window if you wanna surf the internet. You can't navigate through the page with a full screen mode. I hope I explained it clearly and sorry for my bad english, it's not my native language.
Component: Untriaged → Widget: Cocoa
Product: Firefox → Core
bug 1105939 and the depending bugs looks related
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