The search engines I've added do not appear in the list after clicking the green + sign in the search box and they do not appear in the list in the options either. I used the "add more search engines" found in the bottom of the search engines list to find the missing engines and add them again, but when I find the engine I want to add there is only the "remove" button. So this tells me the missing engines in the list are still there but not accessible. I tried removing the added search engine and then adding it again but this did not make them appear in the search engine list. Everything was working fine until getting the last update before Firefox 89. Is there a way to fix this???