How do I restore Firefox 4 to the exact condition it was when it downloaded?

I want to restore Firefox 4 to the exact condition it was when it downloaded before I made any modifications.

You can create a new profile to have a fresh start.
See:
* [[Basic Troubleshooting#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See:
* http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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