Your add-on data is still stored in your old settings folder. You could switch back to your old settings, or you could contact the add-on developer for suggestions on how to copy them over to the new folder. Each settings folder is termed a "profile." To change between different profiles, you can start up Firefox in the Profile Manager. See this article for information on how to start up the profile manager: [[Use the Profile Manager to create and remove Firefox profiles]]. The one you last used will be selected. Try another one to get back to your earlier settings. And to fix video problems in your old profile, see whether this article helps: [[Flash 11.3 doesn't load video in Firefox]].

See also: *https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox