Hi!
I have been having this problem for a while. It was gone for a while after I reseted firefox, but now it's back and even when I do a reset the problem keeps going. This is a shared computer and even when I tell them not to installl anything, I'm sure they do.
This is what I have on Terminal:
Last login: Sun Mar 15 07:35:30 on console
Lauras-MacBook:~ Laura$ ls -al ~/Library/Internet\ Plug-Ins; ls -al /Library/Internet\ Plug-Ins
total 24
drwx------+ 8 Laura staff 272 Jan 4 09:33 .
drwx------+ 52 Laura staff 1768 Nov 6 09:40 ..
-rw-------@ 1 Laura staff 6148 Jan 4 09:33 .DS_Store
drwxr-xr-x@ 3 Laura staff 102 Aug 4 2010 BrowserPlus_2.9.8.plugin
drwxrwxr-x 3 Laura admin 102 Mar 31 2010 ClickToFlash.webplugin
lrwxr-xr-x 1 Laura staff 96 Jul 11 16:45 FacebookVideoCalling.bundle -> /Users/Laura/Library/Application Support/Facebook/video/1.2.0.158/FacebookVideoCalling.webplugin
drwxr-xr-x@ 3 Laura admin 102 Oct 14 2009 Move-Media-Player.plugin
drwxr-xr-x 3 Laura staff 102 Aug 12 2010 Picasa.plugin
total 80
drwxrwxr-x 31 root admin 1054 Dec 22 10:11 .
drwxrwxr-t+ 60 root admin 2040 Dec 24 2011 ..
-rw-rw-r--@ 1 Laura admin 15364 Oct 30 21:32 .DS_Store
drwxr-xr-x 3 root wheel 102 Oct 25 2010 AdobePDFViewer.plugin
drwxr-xr-x 3 root wheel 102 Apr 12 2012 AdobePDFViewerNPAPI.plugin
lrwxr-xr-x 1 Laura admin 92 Mar 5 2012 AmazonMP3DownloaderPlugin.plugin -> /Applications/Amazon MP3 Downloader.app/Contents/Resources//AmazonMP3DownloaderPlugin.plugin
lrwxr-xr-x 1 root admin 91 Aug 4 13:15 AmazonMP3DownloaderPlugin1017265.plugin -> /Applications/Amazon MP3 Downloader.app/Contents/Resources/AmazonMP3DownloaderPlugin.plugin
drwxrwxr-x 3 root admin 102 Sep 20 2011 CouponPrinter-FireFox_v2.plugin
drwxrwxr-x 3 root admin 102 Sep 20 2011 CouponPrinter-Safari.webplugin
drwxrwxr-x 3 root admin 102 Jan 30 2012 DirectorShockwave.plugin
drwxrwxr-x 4 root admin 136 Oct 30 21:35 Disabled Plug-Ins
drwxrwxr-x 3 root admin 102 Dec 10 18:51 DivXBrowserPlugin.plugin
drwxrwxr-x 3 root admin 102 Nov 13 21:36 Flash Player.plugin
drwxrwxr-x 3 root admin 102 Jun 30 2011 Flip4Mac WMV Plugin.plugin
lrwxr-xr-x 1 root admin 77 Jul 7 2011 JavaPluginCocoa.bundle -> /System/Library/Frameworks/JavaVM.framework/Versions/A/JavaPluginCocoa.bundle
drwxr-xr-x 3 root admin 102 Jan 17 2012 OVSHelper.plugin
drwxrwxr-x 3 root wheel 102 Feb 14 2012 PDF Browser Plugin.plugin
drwxr-xr-x@ 3 root admin 102 Mar 30 2010 PandoWebInst.plugin
drwxrwxr-x 3 root admin 102 Sep 24 2007 Quartz Composer.webplugin
drwxrwxr-x 3 root admin 102 Nov 5 12:18 QuickTime Plugin.plugin
drwxrwxr-x 3 root admin 102 Jun 14 2008 QuickTime Plugin.webplugin
lrwxr-xr-x 1 Laura admin 68 Apr 8 2009 RealPlayer Plugin.plugin -> /Applications/RealPlayer.app/Contents/MacOS/RealPlayer Plugin.plugin
drwxrwxr-x 3 root admin 102 Apr 11 2012 Silverlight.plugin
drwxr-xr-x 3 root admin 102 Jan 28 2010 VeetleBroadcast-0.9.16
drwxr-xr-x 3 root admin 102 Jan 25 2010 VeetleTVCore-0.9.16
drwxr-xr-x 3 root admin 102 Jan 28 2010 VeetleTVPlayer-0.9.16
drwxrwxr-x 3 root admin 102 Dec 12 2007 VerifiedDownloadPlugin.plugin
drwxr-xr-x@ 4 Laura admin 136 Nov 28 2007 Yahoo! Installer 3.plugin
-rw-rw-r-- 1 root admin 856 Oct 30 12:50 flashplayer.xpt
drwxrwxr-x 3 root admin 102 Jul 14 2008 iPhotoPhotocast.plugin
-rw-rw-r-- 1 root admin 2394 Jun 25 2011 nsIQTScriptablePlugin.xpt
Lauras-MacBook:~ Laura$
Can anybody help me? Tell me what should I do to solve this? Thanks.