TODO: Fix selected rectangle size for tiles at https://start.dlma.com/david/

Should probably get used to using @ as the custom search engine prefix.

about:preferences#search suggests the canonical way is to use mycroftproject. But you can also do the “site search” thing with the following tweak: From emvaized's reply at "Adding custom search engines":

Go to about:config page and set browser.urlbar.update2.engineAliasRefresh flag to “true”