Firefox doesn't work right under my normal login account, but is fine under another account. How do I clear my account settings in my normal account?

Question

Shortly after installing FF4.0, it rendered a local (on my hard drive) website incorrectly. One page, with frames, has more than 1000 list entries each containing a link to another page. The links suddenly become plain text after a few hundred lines of rendered text. Other browsers render the page correctly, as FF did earlier as well.
Then FF began to crash. When I googled "firefox crashes" it crashed as I clicked the mozilla site link provided by google.
I followed various trouble-shooting pages on the mozilla site, but could not isolate the problem to any extension or plug-in. The problems persisted even with no plugins and no extensions. I backed off to FF3.6.12 and got the same problems. I logged into a different account and the problems disappeared.
I clearly need to completely uninstall FF in my main login account and reinstall it but I haven't been able to find all the files that need to be trashed.
What do I do?
best,
Lou

Answer 1

@fernandamagalhaes
It looks like the article below has the information you are looking for.
iCloud: Change iCloud feature settings
http://support.apple.com/kb/PH2613
Turn off iCloud completely
Depending on whether you want to stop using iCloud on all or only some devices, do one or more of the following:
On your iOS device’s Home screen, go to Settings > iCloud, then at the bottom of the screen, tap Delete Account.
Note:   If you delete your iCloud account, iCloud will no longer back up your iOS data. You can still back up your device in iTunes (for more information, open iTunes and choose iTunes > Help). 
On your Mac, open iCloud preferences, then click Sign Out.
If your Mac has OS X v10.7.5 and you turn off iCloud, your calendar information and reminders aren’t stored locally in iCal. If you want to retain your calendar and reminder information, you need to back it up before turning off iCloud. For more information, see the Apple Support article iCloud: Calendar & reminder data removed from Calendar and Reminders or iCal when disabling iCloud Calendar.
On your Windows computer, open the iCloud Control Panel, then click Sign Out.
Note:   If you turned on automatic download of music, app, or book purchases (in iTunes preferences or in Settings on your iOS device), your iTunes purchases are still downloaded to your devices.
Set up iCloud on your devices