After use and not even long use dropdown menus are blank, Firefox won't close.

For a couple of weeks after a short time of use dropdown menus are blank almost as if they have been lifted off the screen but I can see an imprint of where they should be.. Sometimes running the cursor over them seems to make them appear but not often.
When this happens I cannot close Firefox.
== This happened ==
Every time Firefox opened
== a couple of weeks ago

From your description, it seems that an add-on may me causing your issue. Follow the steps at [[Troubleshooting extensions and themes]] to test whether your extensions are causing this behavior. Reply back here with the results and with the name(s) of any extensions you have enabled.

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EtreCheck version: 1.9.15 (52)
Report generated August 30, 2014 at 6:56:41 PM EDT
Hardware Information: ?
 iMac (21.5-inch, Mid 2011) (Verified)
 iMac - model: iMac12,1
 1 2.5 GHz Intel Core i5 CPU: 4 cores
 4 GB RAM
Video Information: ?
 AMD Radeon HD 6750M - VRAM: 512 MB
 iMac 1920 x 1080
System Software: ?
 OS X 10.9.4 (13E28) - Uptime: 0 days 0:16:53
Disk Information: ?
 ST3120026AS disk0 : (120.03 GB)
 S.M.A.R.T. Status: Verified
 EFI (disk0s1) <not mounted>: 209.7 MB
 Untitled (disk0s2) / [Startup]: 119.17 GB (87.12 GB free)
 Recovery HD (disk0s3) <not mounted>: 650 MB
 HL-DT-STDVDRW GA32N
USB Information: ?
 Apple Inc. FaceTime HD Camera (Built-in)
 CHICONY USB NetVista Full Width Keyboard
 Apple Inc. BRCM2046 Hub
 Apple Inc. Bluetooth USB Host Controller
 Apple Computer, Inc. IR Receiver
 Apple Internal Memory Card Reader
Thunderbolt Information: ?
 Apple Inc. thunderbolt_bus
Gatekeeper: ?
 Anywhere
Kernel Extensions: ?
 [loaded] com.nvidia.CUDA (1.1.0) Support
 [loaded] com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
 [loaded] com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
 CUDA: Path: /System/Library/StartupItems/CUDA
 FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Launch Daemons: ?
 [loaded] com.adobe.fpsaud.plist Support
 [running] com.arcsoft.eservutil.plist Support
 [running] com.bjango.istatmenusdaemon.plist Support
 [loaded] com.oracle.java.Helper-Tool.plist Support
 [running] com.sophos.autoupdate.plist Support
 [running] com.sophos.configuration.plist Support
 [running] com.sophos.intercheck.plist Support
 [running] com.sophos.notification.plist Support
 [running] com.sophos.scan.plist Support
 [running] com.sophos.sxld.plist Support
 [running] com.sophos.webd.plist Support
Launch Agents: ?
 [running] com.arcsoft.esinter.plist Support
 [running] com.bjango.istatmenusagent.plist Support
 [loaded] com.nvidia.CUDASoftwareUpdate.plist Support
 [loaded] com.oracle.java.Java-Updater.plist Support
 [running] com.sophos.uiserver.plist Support
User Login Items: ?
 Macs Fan Control
 Firefox
Internet Plug-ins: ?
 FlashPlayer-10.6: Version: 14.0.0.176 - SDK 10.6 Support
 Flash Player: Version: 14.0.0.176 - SDK 10.6 Support
 QuickTime Plugin: Version: 7.7.3
 JavaAppletPlugin: Version: Java 7 Update 67 Check version
 Default Browser: Version: 537 - SDK 10.9
Audio Plug-ins: ?
 BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
 AirPlay: Version: 2.0 - SDK 10.9
 AppleAVBAudio: Version: 203.2 - SDK 10.9
 iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
 Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
 CUDA Preferences Support
 Fan Control Support
 Flash Player Support
 Java Support
Time Machine: ?
 Time Machine not configured!
Top Processes by CPU: ?
 1% WindowServer
 1% fontd
 0% firefox
 0% SystemUIServer
 0% SophosWebIntelligence
Top Processes by Memory: ?
 229 MB firefox
 156 MB SophosScanD
 152 MB InterCheck
 131 MB com.apple.IconServicesAgent
 115 MB SophosAntiVirus
Virtual Memory Information: ?
 424 MB Free RAM
 1.53 GB Active RAM
 1.37 GB Inactive RAM
 699 MB Wired RAM
 1.26 GB Page-ins
 0 B Page-outs

I'd start by getting rid of the following software responsible for these extensions.
Kernel Extensions: ?
 [loaded] com.nvidia.CUDA (1.1.0) Support
 [loaded] com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
 [loaded] com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
 CUDA: Path: /System/Library/StartupItems/CUDA
 FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Use the uninstaller provided with the Sophos software. You can uninstall CUDA via the preference pane. Be sure you remove the com.nvidia.CUDA extension which is located in the /System/Library/Extensions/ folder. Not sure if Fan Control has an uninstaller so you will have to do it manually:
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
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Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
 1. AppZapper
 2. AppDelete
 3. Automaton
 4. Hazel
 5. AppCleaner
 6. CleanApp
 7. iTrash
 8. Amnesia
 9. Uninstaller
10. Spring Cleaning
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Be sure to remove your two Login Items. Finally do this:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
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Reinstall Lion, Mountain Lion, or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
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After use and not even long use dropdown menus are blank, Firefox won't close.

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