Unable to search or add new engines
From MozillaZine Knowledge Base
Firefox 1.5
If you are unable to search or add new search engines in Firefox 1.5 or earlier, the issue is likely a corrupt localstore.rdf file. See this article for a solution.
Firefox 2
Starting in Firefox 2, the search function no longer relies on localstore.rdf [1]. If the Search Bar no longer works and you can't add, reorder, remove or otherwise manage the search engines:
- Exit Firefox and go to your profile folder.
- Delete (or rename) the file "search.sqlite".
Re-start Firefox to see if it solves your problem.
