The behavior may be also vary depending on whether it's an actual link a document or direct input to the location bar. (I get different prompts on Firefox, whil

The behavior may be also vary depending on whether it's an actual link a document or direct input to the location bar. (I get different prompts on Firefox, while both will forward to the built-in system dictionary.) And, of course, any further configurations may alter this, e.g., another service may have been registered for this protocol.