My Firefox (3.0.3) completely freezed, so I couldn't kill the process (or there was no proces to be more presice).
Then I deleted .parentlock and now I can start Firefox up and surf etc., but I CANNOT add bookmarks, use the google search field next to the address bar and some other stuff.
And every tab I have open (except the first one) have the loading (rotating thing) on it all the time.
I've tried to remove it completely and did a fresh install, but no luck...????

Hmm, it sounds like it may be
Hmm, it sounds like it may be a problem with your .mozilla profile folder, so I'd try to remove your profile and let Firefox create a new one, but first saving your bookmarks.
To do this, the easiest way is actually via the Terminal, so go to Applications > Terminal
(make sure you close down Firefox first before you start!)
You'll start up in your home directory, so change into the .mozilla folder like this:
(make sure you remember the . infront of mozilla).
If you use iceweasel then change the /firefox to /iceweasel etc.
you should see a few files and a folder with lots of numbers in it. Change into that folder like so:
(or whatever your .default folder is called).
Then, copy the bookmarks into the directory below, to back it up.
Finally, remove the profile folder:
next time you start up firefox, it will create a new .default profile folder
move your bookmarks back into that folder:
where 4382748ffe.default is the new default folder that has been created (you can see this as before with the ls command).
Hope this works for you.
I also cannot reload pages!
I also cannot reload pages!