Hi, The extension folder is under Profile folder so it should also be copied with it. http://kb.mozillazine.org/Profile_folder_-_Firefox Please refer to this article to check if you performed your migration correct: http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox Also in this article it is mentioned: ''extensions (folder) - Contains added themes and extensions. Not recommended to transfer if you had problems in your old profile. After copying this folder or its contents to the new profile, delete the "extensions.ini", "extensions.cache" and "extensions.rdf" files from the profile folder. These files will be regenerated when you start Firefox. Note that some extensions store data in additional files in the profile, usually at the top of the directory. You'll need to move them separately.'' If above clues would not help you sort it out, I believe you should just go and reinstall them. Hope it helps!