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I have a Macbook Pro 11,1 running OS X El Captian. Recently, whenever in an application such as Firefox my menu bar and dock disappear. This is really annoying, as in system preferences both my dock & menu bar are set to not autohide. If I click the desktop, suddenly the dock and menu bar pop back up.

Any suggestions?

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    Does the Firefox menu bar disappear as well? Are you running Firefox in Fullscreen-Mode? What happens if you just move the mouse to the top of the screen (with Firefox still the active application)? – nohillside Jan 6 '16 at 16:13
  • I believe it's a bug. What are you doing specifically when it disappears? I have the same issue when watching videos driven by the silverlight player. – Harv Jan 6 '16 at 18:29
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It turns out this is a bug with Firefox. These instructions I found fixed the issue.

  1. In Finder right click on the Firefox app and select “Show Package Contents”

  2. Navigate to Contents and open “Info.plist” in TextEdit.

  3. In this file, near the top, there should be a piece of text that says < dict >, underneath this add the following making sure all of the text is present.

    <key>LSUIPresentationMode</key>
    <integer>0</integer>
    
  4. Save that file

  5. Restart Firefox
  6. Happy browsing again

src: https://discussions.apple.com/thread/3096551?tstart=0

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