Important addition: You'll have to set browser.urlbar.update2.engineAliasRefresh to true in about:config to see the option to add search engines via URL. Otherwise you'll just see the option to remove them and a link to the add-ons page.
browser.urlbar.update2.engineAliasRefresh
true
Important addition: You'll have to set
browser.urlbar.update2.engineAliasRefreshtotruein about:config to see the option to add search engines via URL. Otherwise you'll just see the option to remove them and a link to the add-ons page.