Crashes when downloading, didn't used to do it before the latest update, wont let me reset general.useragent as suggested, any ideas?

After I downloaded and installed the latest update, it will not let me download anything, it crashes.
I tried the things suggested in the troubleshooting and nothing worked, it wouldn't even give me the reset option on the general.username files.
What next?
Can I revert to my older version that worked fine?
I can download fine on Safari but prefer using Firefox.

You can restart your mini holding the command and R keys down to enter Lion recovery mode.
http://www.apple.com/macosx/recovery/
http://support.apple.com/kb/HT4718

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