Recently, I decided to try a different search engine in place of Google, which I removed from my list of search engines in the search bar via Manage Search Engines. Dissatisfied with this search engine, I decided to switch back, using an add-on called Add to Search Bar. However, this disables the autocomplete feature for that search engine. I was able to get the autocomplete feature back by restoring the default search engines in the Manage Search Engines menu. However, now I can't remove the instance of Google's search engine which I installed with the add-on. When I remove it, the OK button becomes unresponsive and I'm forced to cancel. Add to Search Bar https://addons.mozilla.org/en-US/firefox/addon/add-to-search-bar/ I don't have any trouble deleting other search engines installed by this add-on, other than this Google one. The .xml file for this search engine doesn't appear in the searchplugins folder in my profile folder.