I never removed the search engines, but it says I have no search engines installed.

I can't search for anything as I have no search engines. I have tried to search the add-ons to add a search engine, but cannot find basic search engines that usually come included with the browser like Google, yahoo, Amazon, etc. How do I reinstall these search engines.

You can try to delete search.sqlite and search.json in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder]
Create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile.
* http://kb.mozillazine.org/Testing_pre-release_versions
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

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