Try a clean reinstall and drag the current Firefox application to the Trash.

You can find the full version of the current current Firefox release (38.0.5) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

The clean re-install didn't work. Creating a new profile did work initially, but when I went to import all of my information from my old profile, Firefox froze again.

I think it may be an issue with some file in the profile itself. Suggestions?

What files did you restore from the old profile?

It is usually best not to copy the full profile folder, but only restore files with personal data that you really need like the

• bookmarks and history: places.sqlite and the backups in the bookmarkbackups folder
• other SQLite files like cookies.sqlite (Cookies) and formhistory.sqlite (saved form data)
• logins.json and key3.db for the passwords.
• permissions.sqlite and possibly content-prefs.sqlite for the permissions and Site Preferences
• cert8.db for stored intermediate certificates
• sessionstore.js for (pinned) tabs

Verify that Firefox keeps working properly before proceeding to the next file.