Why does Firefox not launch after safe boot?

Folks:
I've been using ML for several months, no particular issues, yesterday as part of the monthly maintenance I did a safe boot, and after that firefox will not launch. Other 3rd party apps will launch, and of course Safari will . . . but, any thoughts as to why FF would go "limp"? When I click on it in the dock the icon bounces but then returns to the dock . . . I tried to launch it from the application folder and from the "previous application" launcher . . . . I tried it in a "guest" account that is never used . . . no difference. I did try to do something in the Terminal, but since I'm thinking that very soon I'm switching up to Mav, I haven't bothered to figure out how to add my regular user account to the sudoers list. But, I did try to launch FF in my admin account by the regular methods yesterday, no luck. Any ideas why this is happening . . . to me? Solutions are better, but, conspiracy theories also accepted . . . . =8 - 0
e.e.p.

Ran "Repair Permissions" several times . . . seems to be fixed.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
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Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it. The headings “Step 1” and so on are not part of the commands.
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Launch the Terminal application in any of the following ways:
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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click the line of text below to select it:
for k in {,/S*}/L*/E*/{,.?}*.kext; do test -f "$k/Contents/Info.plist" && /usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" "$_" | egrep -qv "apple|Accusys|ArcMSR|ATTO|CalDigit|HighPoint|hp-fax|JMicron|print|SoftRAID|stex" && echo $k; done | open -f -a TextEdit
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Step 2
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Step 3
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Step 4
osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null | open -f -a TextEdit
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*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
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*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

Why does Firefox not launch after safe boot?

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