Dock disappears for a few seconds and minimized apps open up

Hello
My dock at the bottom of the display will disappear for a few seconds and at the same time, my minimized open applications will open up. This usually happens when I'm running a few light applications at once. It almost seems to "gulp" or catch it's breath.
I'm not sure if this is related but for the second time since purchasing the machine the dock is showing a sort of double reflection at the very bottom. An open application has what looks like two lit triangles underneath the icon instead of the usual one triangle. The same area at the bottom of the dock shows a very tiny "bottom" of the page I have open, in this case Safari. It also moves left and right as I move the open page left and right. If I move the page down, the sliver at the bottom of the dock moves up.
This is only the second time this has happened. The first time it went away on it's own and today it's back. It's not troublesome at all but I'm just wondering what may be causing these symptoms.
Thanks!

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

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