[Geowanking] opensearch geo extension?

[Rushforth, Peter]

Hi,

Does anyone know of a firefox extension (or other web application even)
which supports opensearch geo query generation? 

When you enter text into the ff search widget, it generates the text
query, but a map interface would be nice for that widget, if the
selected opensearch description document contains opensearch geo markup.
That would allow the filling in of the geo:box or other parameter based
on a selected or user-generated geometry.

Thanks,
Peter Rushforth