I think safari is freezing my system

Question

I recently upgraded to ML.  Every so often, I'll be using safari and my entire computer will freeze.  My mouse will still move around (although it may be stuck as a beachball, or not).  However, I cannot click on anything.  No keyboard shortcuts work.  Even the time in the corner will stop.  As far as I can remember, the only times this has happened was when I had several tabs in safari open.  However, I don't recall there being a pattern to the individual websites that are up.  Moreover, there are times when I've had the same number or more tabs open and no problem has occured.
Whenever this happens, the only way I can get control over my computer again is to hold the power button until the machine shuts off.
I saw in other posts that someone suggested checking the console after this happens.  Immediately before the most recent freeze, I got the following messages:
8/15/12 4:39:26.225 PM com.apple.launchd[1]: (com.apple.sleepservicesd[7579]) Exited: Killed: 9
8/15/12 4:39:26.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7579 [SleepServicesD]
8/15/12 4:39:27.158 PM com.apple.launchd.peruser.501[133]: (com.apple.CalendarAgent[7575]) Exited: Killed: 9
8/15/12 4:39:27.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7575 [CalendarAgent]
8/15/12 4:40:00.305 PM com.apple.launchd[1]: (com.apple.sleepservicesd[7588]) Exited: Killed: 9
8/15/12 4:40:00.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7588 [SleepServicesD]
8/15/12 4:40:00.817 PM com.apple.launchd[1]: (com.apple.iCloudHelper[7072]) Exited: Killed: 9
8/15/12 4:40:00.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7072 [com.apple.iCloud]
8/15/12 4:40:05.833 PM com.apple.launchd[1]: (com.apple.xpcd.F5010000-0000-0000-0000-000000000000[7060]) Exited: Killed: 9
8/15/12 4:40:05.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7060 [xpcd]
8/15/12 4:40:12.657 PM com.apple.launchd[1]: (com.apple.sleepservicesd[7591]) Exited: Killed: 9
8/15/12 4:40:12.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7591 [SleepServicesD]
8/15/12 4:40:25.067 PM com.apple.launchd[1]: (com.apple.sleepservicesd[7593]) Exited: Killed: 9
8/15/12 4:40:25.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7593 [SleepServicesD]
8/15/12 4:40:25.399 PM com.apple.launchd[1]: (com.apple.cfprefsd.xpc.daemon[4032]) Exited: Killed: 9
8/15/12 4:40:25.000 PM kernel[0]: memorystatus_thread: idle exiting pid 4032 [cfprefsd]
8/15/12 4:40:25.895 PM com.apple.launchd.peruser.501[133]: (com.apple.cfprefsd.xpc.agent[4031]) Exited: Killed: 9
8/15/12 4:40:26.000 PM kernel[0]: memorystatus_thread: idle exiting pid 4031 [cfprefsd]
8/15/12 4:40:26.671 PM Messages[7246]: In void modifyShouldRestoreOnRelaunchCounter(int32_t), _LSSetApplicationInformationItem(_kLSPersistenceSuppressRelaunchAtLoginKey) returned error -600
8/15/12 4:40:56.491 PM com.apple.launchd[1]: (com.apple.cfprefsd.xpc.daemon[7601]) Exited: Killed: 9
8/15/12 4:40:56.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7601 [cfprefsd]
8/15/12 4:40:59.349 PM com.apple.launchd[1]: (com.apple.xpcd.F5010000-0000-0000-0000-000000000000[7600]) Exited: Killed: 9
8/15/12 4:40:59.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7600 [xpcd]
8/15/12 4:40:59.748 PM com.apple.launchd.peruser.501[133]: (com.apple.cfprefsd.xpc.agent[7595]) Exited: Killed: 9
8/15/12 4:40:59.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7595 [cfprefsd]
8/15/12 4:41:00.031 PM com.apple.launchd[1]: (com.apple.sleepservicesd[7594]) Exited: Killed: 9
8/15/12 4:41:00.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7594 [SleepServicesD]
8/15/12 4:41:00.594 PM com.apple.launchd.peruser.501[133]: ([0x0-0x5a15a1].com.apple.inputmethod.ironwood[7578]) Exited: Killed: 9
8/15/12 4:41:00.000 PM kernel[0]: memorystatus_thread: idle exiting pid 7578 [DictationIM]
8/15/12 4:45:55.214 PM coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationCreation to notificationID=127
8/15/12 4:48:00.759 PM coreservicesd[63]: SendFlattenedData, got error #268435460 (ipc/send) timed out from ::mach_msg(), sending notification kLSNotifyApplicationDeath to notificationID=115
I checked the console after previous crashes, and the only comments I remember seeing in common are the last two.
If anyone can help me figure out what's going on, it would be appreciated.

Answer 1

I doubt that any of that is related, but you might as well fix it.
The procedure below will unlock and reset the permissions of all files in a user folder under OS X 10.7.4 or later. If you're running an earlier version of 10.7, update to the latest version first. This procedure should not be used with OS X versions older than 10.7.4.
Back up all data before you begin.
Part A
Enter the following shell command in the same way as above (without typing):
sudo chflags -R nouchg,nouappnd ~ $TMPDIR..
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command.
The command will take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear, then quit Terminal.
Part B
Step 1
Click the Finder icon in the Dock. A Finder window will open.
Step 2
Press the following key combinations, in the order given:
Command-3
Shift-command-H
Command-I (the letter "I" as in "Info")
The Info window of your home folder will open.
Step 3
Click the lock icon in the lower right corner and authenticate with the name and login password of an administrator on the system. If you have only one user account, you are the administrator.
Step 4
In the Sharing & Permissions section of the window, verify that you have "Read & Write" privileges. If not, use the "+" and "-" buttons in the lower left corner to make the necessary changes.
Step 5
By default, the groups "staff" and "everyone" have "Read Only" privileges. With those settings, the files at the top level of your home folder will be readable by other local users. You can change the privileges to "No Access" if you wish, but then your Public and Drop Box folders will be inaccessible to others, and Personal Web Sharing won't work. Most likely, you don't need to change these settings.
Step 6
If there are entries in the Sharing & Permissions list for users or groups besides "me," "staff," and "everyone," delete them.
Step 7
Click the gear icon at the bottom of the Info window and select Apply to enclosed items... from the drop-down menu. Confirm. The operation may take several minutes to complete. When it does, close the Info window.