Customizing The Tool Bar and Setting Preferences Problems

Question

Need Help With Safari
While trying to customize the toolbar and setting preferences like setting auto fill, adding Develop or any other preference everything looks fine, I shut down Safari and re-open and everything I changed has been lost.  I've tried removing the P-Lists, re-installing Mountian Lion 10.8.4 and several other things to fix this problem.
One other thing that happens is, I try to add a new folder to the favorites bar and all it does is loop. once the looping startes I have to force quite.  The only way to add a new folder is on my iPhone or iPad.

Answer 1

Triple-click the line below to select it:
~/Library/Preferences/com.apple.Safari.plist
Right-click or control-click the highlighted line and select
Services ▹ Show Info
from the contextual menu.* An Info dialog should open.
Does the dialog show "You can read and write" in the Sharing & Permissions section?
In the General section, is the box labeled Locked checked?
What is the Modified date?
*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). Open a TextEdit window and paste into it (command-V). Select the line you just pasted and continue as above.