After Firefox has been running a while, every link opens a new window

After Firefox has been running for a while, every link starts opening in a new window. Until today, if I closed Firefox and restarted it, it would stop happening ... until it started happening again. Then today, I closed it down and restarted it, and it was STILL happening. So either I find a solution, or I stop using Firefox on my Mac.
This is a vanilla installation - both for the Mac and Firefox. I don't use the Mac as my main computer. The Mac is running OS X 10.5 8. The problem has existed through many upgrades of Firefox. I always upgrade as requested. This last time, however may have been the killer. A new upgrade was installed right before the problem became unfixable by shutting down and restarting. I'm running Firefox 15.0. I just rebooted, however, and now (for now), it's working properly.
I have no add-ons installed in Firefox.
My only plug-ins are iPhotoPhotocast, QuickTime, SharePoint, and Shockwave Flash.
I've seen multiple reports of this problem on this Web site, but no solutions. Just a generic recommendation to disable add-ons to see which one is conflicting. But I'm running no add-ons. I think there's a bug in Firefox.

If it were an extension or theme or a Mac driver, wouldn't it cause the problem consistently? This only happens after Firefox has been running for a while. I'm using Firefox to type this reply right now, and the problem is not happening.
And it's not because I suddenly start using some offending software. As I said, I don't use the Mac as my main computer. Usually I'll have been using my PC, I'll go back to the Mac to check my email on Firefox, and suddenly the link problem is happening. I only use the Mac to check email on the server before I download it with Outlook (on the PC) so I can delete spam on the server first.

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Firefox is already running, but not responding to open a new window

I closed the only opened Firefox process that was running. Then clicked the Fox to start Firefox again. I received a message: Firefox is already running, but not responding, to open a new window. You must close the existing Firefox process, or restart your system. This is a stupid message since there is no Firefox in process.
== This happened ==
Not sure how often

Hello Lara.
Hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit

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As I stated above, I have to constantly restart my computer because I get a message stating firefox is already running.

Do you see a firefox.exe in the Task manager if you look there right after you get this error message?
You do not have to restart the computer, just kill that process.
This situation may occur if Firefox was not closed correctly or crashed.

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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
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* [[Troubleshooting plugins]]
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* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
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Hello,
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[[Image:FirefoxSafeMode|width=520]] 
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[[Image:Safe Mode Fx 15 - Win]]
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''To exit 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 others with the same problem.
Thank you.

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*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
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*http://kb.mozillazine.org/about:config
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thanks
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Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I have an early 2011 MacBook Pro which has been running slow for a while. After looking at responses to similar problems I have downloaded and run EtreCheck and will post the output. Please can someone help me with what it all means.Thanks in advance

I have an early 2011 MacBook Pro which has been running slow for a while. After looking at responses to similar problems I have downloaded and run EtreCheck. Please can someone help me with what it all means.
Thanks in advance.
EtreCheck version: 1.9.15 (52)
Report generated 19 September 2014 08:07:14 GMT+8
Hardware Information: ?
MacBook Pro (13-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,1
1 2.3 GHz Intel Core i5 CPU: 2 cores
4 GB RAM
Video Information: ?
Intel HD Graphics 3000 - VRAM: 384 MB
Color LCD 1280 x 800
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 0 days 0:4:29
Disk Information: ?
Hitachi HTS545032B9A302 disk0 : (320.07 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 319.21 GB (147 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
MATSHITADVD-R UJ-898
USB Information: ?
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ?
Apple Inc. thunderbolt_bus
Gatekeeper: ?
Mac App Store and identified developers
Kernel Extensions: ?
[not loaded] com.seagate.driver.PowSecDriverCore (5.2.4 - SDK 10.4) Support
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.2.4 - SDK 10.4) Support
[not loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.2.4 - SDK 10.5) Support
[not loaded] com.seagate.driver.SeagateDriveIcons (5.2.4 - SDK 10.4) Support
[loaded] com.sophos.kext.sav (9.1.55 - SDK 10.7) Support
[loaded] com.sophos.nke.swi (9.1.50 - SDK 10.8) Support
Launch Daemons: ?
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.microsoft.office.licensing.helper.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
[running] com.trusteer.rooks.rooksd.plist Support
Launch Agents: ?
[loaded] com.divx.dms.agent.plist Support
[loaded] com.divx.update.agent.plist Support
[running] com.sophos.uiserver.plist Support
[running] com.trusteer.rapport.rapportd.plist Support
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[loaded] com.adobe.ARM.[...].plist Support
[running] com.amazon.music.plist Support
[loaded] com.google.keystone.agent.plist Support
[not loaded] jp.co.canon.Inkjet_Extended_Survey_Agent.plist Support
User Login Items: ?
iTunesHelper
TomTomHOMERunner
AdobeResourceSynchronizer
Dropbox
Internet Plug-ins: ?
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
DivX Web Player: Version: 3.2.1.977 - SDK 10.6 Support
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Support
EPPEX Plugin: Version: 10.0 Support
Default Browser: Version: 537 - SDK 10.9
OVSHelper: Version: 1.1 Support
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.4.4 - SDK 10.6 Support
iPhotoPhotocast: Version: 7.0 - SDK 10.7
Safari Extensions: ?
Ultimate
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: ?
Flash Player Support
Perian Support
Trusteer Endpoint Protection Support
Time Machine: ?
Skip System Files: NO
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 297.29 GB Disk used: 160.38 GB
Destinations:
Data [Network] (Last used)
Total size: 2 TB
Total number of backups: 99
Oldest backup: 2012-04-20 17:05:32 +0000
Last backup: 2014-09-18 23:49:25 +0000
Size of backup disk: Excellent
Backup size 2 TB > (Disk size 297.29 GB X 3)
Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU: ?
 6% InterCheck
 5% iCalExternalSync
 3% WindowServer
 2% CalendarAgent
 2% SystemUIServer
Top Processes by Memory: ?
152 MB SophosScanD
147 MB InterCheck
106 MB SophosAntiVirus
66 MB Dropbox
57 MB com.apple.iTunesLibraryService
Virtual Memory Information: ?
161 MB Free RAM
1.55 GB Active RAM
1.41 GB Inactive RAM
902 MB Wired RAM
611 MB Page-ins
0 B Page-outs

Uninstall Trusteer software
http://www.trusteer.com/support/uninstalling-rapport-mac-os-x
Remove Sophos
https://discussions.apple.com/message/21069437#21069437

After Firefox has been running a while, every link opens a new window

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