Disconnect Search is not set correctly for English 5.0a3 bundles
It looks like the Disconnect search is not being set for the English bundles. They still default to Yahoo. For some reason, it seems that the non-English bundles have the proper default.
I suspect this is due to the geolocalization checks in ./toolkit/components/search/nsSearchService.js.
I think if we also set browser.search.defaultenginename.US in our compiled-in prefs, it should properly reset the engine for English