Hmmm! A second bite of the cherry, if I may?
The problem has returned after a very short while and deleting that plist again results in a short period of success followed by another google/Safari lockout.
We have yet to identify any action which might trigger this problem although there is, doubtless, something somewhere - but what and where?
Can anyone suggest what might be corrupting that file or what might be causing this google/Safari conflict?
Or something else that we haven't thought of?
I know this is old post, but I am having similar trouble on a used MacBook. Everything works fine on administrator login acct. On Guest acct I can not access google (and a few others).
I have also cleared and deleted things, but no the cookies.plist as suggested above.
The Home folder being "Apple" with the house icon? Where do I find "cookies" from there? There are many folders and sub folders, but Im haing trouble finding cookies, found Cache, no cookies.