Contrary to Brave Search's instructions to click the three dots (...) in Firefox's URL bar to add Brave Search, I don't get the dots at all.

I do get Brave Search as a button when I click the URL bar and it drops down, but if I click on the Brave Search icon to add it, Firefox says:

Invalid format Firefox could not install the search engine from: https://search.brave.com/auth/assets/opensearch.xml